Malicious PDF — malware analysis report

Static analysis result for SHA-256 baa36b0efe012827…

MALICIOUS

PDF

91.4 KB Created: 2021-06-26 14:20:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0f8634f44f2f28e53991fd17b3513712 SHA-1: 7401c74dd36a75d4645cdb1e6ac6e398cd1e43f5 SHA-256: baa36b0efe0128274cfe62434e1cb6e1ae59c3cdd5b9cd8ecde540b976ae7875
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript and multiple links to external URLs hosted on compromised WordPress sites. These links likely serve as a lure to download a second-stage payload, consistent with phishing or malware distribution campaigns. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/jd75k99qadac8a4rvjhokuv6ut/9686108230.pdf In PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a11830f3cf3---totojutakinenagoruwepap.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/h9hhvurd65p0ntj3n2gcsat0tk/pedosoro.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c2748b7cf---bufizidanabi.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/ee22da88ae44c81c9ea5c7f7deba3781/55311311604.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/16679671965.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/mulerudelulerofukefipunaf.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8adb3e08a---kobodakatutekivunusowif.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1c5c828226---bakubinu.pdfIn PDF document text
    • http://abc-tel.ru/data/File/77853397360.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/64ad6536508b86a809e746fd2c0fe0ef/94854905383.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/044b6e17dff22a4c49704c9f5d3f6ad2/subadufav.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16089e332dfd91---digorodir.pdfIn PDF document text
    • http://yuha.be/_files/file/kewiwujenonowupemakomazor.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebd98b405f---21505113456.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/28258898640.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/36341921734.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fdf5b180ee---gitijowizepefoma.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160769fc552add---milukafuzalijebomefirurid.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/d1d5ushv0oj32hslp4rsj1msce/fawoxiwewofetadubirawel.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c692b6368aa---jakodiwamut.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/b57f9d1fb88f01e37a2f6b82173c536f/31338087100.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb4950cd2d1---95494490120.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/87284653945.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/2a1fc34642ac1bf6e4ad85f768909d59/99963933666.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=realidades+1+core+practice+workbook+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CC 18024 bytes
SHA-256: d83ea2757baa068f26b9215329fffce5dc8a43727acf99eb854e777486b80b82
font_01_sfnt_off00012faf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000147c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147C6 10924 bytes
SHA-256: 4baf33752bdc0b62a31842376eeb4ec60bebbc85d95a4b3f314222a3d72a704c

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