Malicious PDF — malware analysis report

Static analysis result for SHA-256 66b1d19b1d7a5c46…

MALICIOUS

PDF

84.7 KB Created: 2021-09-06 08:13:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 42874c00bf45fa9a32851e4862dc227d SHA-1: 8cc465f8e254d826befdd59906c55d464c6347df SHA-256: 66b1d19b1d7a5c464efec9414a69fe337681e90d599d6f9d1fcc1e10b954e83c
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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 https://viessmannboilers.ca/fck_upload/file/rijufomapenutumejufo.pdf In PDF document text
    • http://biotop-zamosc.pl/userfiles/file/xirifuw.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f11640d5aca---77881911455.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/15476883711.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/negefevukorukudidoleb.pdfIn PDF document text
    • http://xn--42c1dhzaq5aeb.com/userfiles/files/24619105196.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161356f6b3c5ff---guluxajo.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/nljtlbh9179coob9j6rbccequm/60587025021.pdfIn PDF document text
    • https://xenang-mitsubishi.com/fckupload/file/65079463186.pdfIn PDF document text
    • http://bulmarconsult.com/files/35379822235.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bd1323cc532---rugilokute.pdfIn PDF document text
    • https://cnn-logistics.com/asset/files/tonudok.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a784c177014---fasuriweviwurena.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mesowijizesozixenekupume.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607238c5ee743---18113017555.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/2b3c9bfs1sm5omqtr7hp7st383/7970061158.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/87545959593.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160cdcb1e194d6---lufuru.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/qircf4hr7mrigc53ir79oojsgm/25259699433.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd7586d45c---lubego.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/70461296299.pdfIn PDF document text
    • http://baoveantam.org/upload/files/zesofenasidovulatuma.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c90f9fc25---beresumulibi.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/nipazamujajileb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=vw+cc+2009+manualPDF link annotation
    • http://www.thaiticketmajor.com/static/imgUpload/files/mibanufo.pdfIn PDF document text
    • 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_off0000e6fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FA 18036 bytes
SHA-256: 69136730f2a1ed293b7227aef7a94034973d3b1527e7f26cf9198d61660f4ffc
font_01_sfnt_off000115d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D9 10244 bytes
SHA-256: d0110a67b25f86dea159edcf2dc76f77fce24a892220d63ea9aeeb21cf299c39
font_02_sfnt_off00012d01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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