Malicious PDF — malware analysis report

Static analysis result for SHA-256 d020c41eee85f447…

MALICIOUS

PDF

88.6 KB Created: 2021-08-18 05:42:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9f62c80213d0bde65e42a435d369a96d SHA-1: 6f4059c5725cf8e129b6117b88281055e194746b SHA-256: d020c41eee85f447d173552e542f4b0ab2ffab99fdec14cef24cbc5a697a779f
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains multiple links to external resources, many of which point to compromised CMS upload directories or disposable hosting, indicating a phishing or malware distribution attempt. The presence of a visual download button and instructions to scan a QR code further support a lure-based attack pattern. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 9

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://goddesshair.net/upload/users/files/lutijomuvivulovok.pdf In PDF document text
    • http://broadgatecapital.com/userfiles/file/zufabazigubapuzizano.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/25d3e0587d2542f6519e1aab4875af72/rosozabuturusexoko.pdfIn PDF document text
    • http://fillaracingacademy.cz/ckfinder/userfiles/files/votiputodivumalepelegel.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/sujotogetiwerafexo.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/b77a0ba3b00eb9114a7082b6023ebdc1/liduvorataluf.pdfIn PDF document text
    • https://coolinterier.sk/upload/files/tipowuvidid.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/jesekozokofotilalajiruwe.pdfIn PDF document text
    • http://www.nbc.com.vn/ckfinder/userfiles/files/86814766987.pdfIn PDF document text
    • http://uco-kampen.com/media/files/regojejixafinazejuwexexud.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/009baa0c47abde984ee9be2ce026e208/80791384766.pdfIn PDF document text
    • http://kramnyca.info/img/upload/editor/file/32694406064.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e062de42d1a---46275629008.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210611203539_1661581758.pdfIn PDF document text
    • http://hmed.vn/upload/files/26737658590.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/buveniwu.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/3aaqks7mrf68lt13majt49j4i3/fetajeselemewaditoguwi.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/9cee32d9fb2b9918008af829a271be7e/31260437435.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160771a79ccc12---difogeku.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/kazuboxudinirepesopote.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1245c1754---10167598810.pdfIn PDF document text
    • http://peterpan1996.it/userfiles/files/wasudisopod.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/67064432833.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1608904fc82e3d---44584585908.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=can+i+use+airdrop+from+android+to+iphonePDF 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_off0000f0d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D6 19240 bytes
SHA-256: c51032012eb98decb8e09b429c3c8e248db3038c84a63f7ede2c16313df9a05a
font_01_sfnt_off00012223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12223 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A3A 10848 bytes
SHA-256: 21352ebaacbcfa26e100a2f96320017d58c7edaf617c55536a0e2c880d3f9d21

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