Malicious PDF — malware analysis report

Static analysis result for SHA-256 b99291910fd4b3e6…

MALICIOUS

PDF

87.4 KB Created: 2021-09-02 09:08:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2dfb9c51d6508b39e88198566e4377d8 SHA-1: 6b49ea650f5b9c54aec54d72b763f0c0b9b5a04a SHA-256: b99291910fd4b3e6b13b08aed0fb4b56658a5c766acca1936d5b2866ab6060f2
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised CMS uploads, a common tactic for hosting malicious files. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a method to bypass gateway scanning. ClamAV also detected this file as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • 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://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/ad94d2c72cea871ee75e9d17658be34b/tefutosarazepiwujebo.pdf In PDF document text
    • http://360global.ca/userfiles/file/50176164029.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/wisesolobe.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/negidupon.pdfIn PDF document text
    • https://rajakedua.com/contents//files/rarizuzonezajulesif.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160708def80d25---62893326711.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/getuzolisotiwexobodid.pdfIn PDF document text
    • https://coil.hk/upload/files/93949450042.pdfIn PDF document text
    • https://loffoxfitness.mvwebsolution.com/userfiles/files/kozexalomix.pdfIn PDF document text
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/6148655946.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1611d1a695cc73---71488804363.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/1801345861.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/movabefiromufukidin.pdfIn PDF document text
    • http://c-six.it/userfiles/files/96862116639.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/lavopelovagive.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/9otbfkml16n3bds2tnd3g7nvu2/84663903194.pdfIn PDF document text
    • http://thaide.org/userfiles/file/sawafovukavesosim.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/82661250015.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/66906998874.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/65b06a2d14d55c8d196b8f375a3639aa/99193145831.pdfIn PDF document text
    • https://gullyracing.it/admin/ckfinder/userfiles/files/pelibepuzexiwore.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160829d434adf5---robajavuxusaju.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/45242006815.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/biwofa.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/ueucpl2uur8q9vu3o8p1j0n0r6/34127493665.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/c3ee48015c5858e33abec3f22bc3e565/13524428454.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=empathy+meaning+in+englishPDF 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_off0000e780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE780 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF92 21428 bytes
SHA-256: 6334392ccfe76abeec7211101a0e548186be09416bc77c5da42a766f4db6ab4c
font_02_sfnt_off00013780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13780 10576 bytes
SHA-256: 434105939eab3102197d20257685e22108543ced9433f30150a28f5d14ecfb48