Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2e7288637b46d2f…

MALICIOUS

PDF

68.6 KB Created: 2021-09-29 04:00:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a21bdb22bb1b77f9bb6f076ea9b4a979 SHA-1: 4a32ded7b02167dbd9b4d2b99ebad99c39b90fe3 SHA-256: f2e7288637b46d2ff2ff201cf7d316e5d8afd84a0e921fdcdaeee826390e75ca
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of embedded URLs and the heuristic 'SE_LOLBIN_RUN_COMMAND' further support the classification as a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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 http://villkasz.hu/editor_up/12205456482.pdf In PDF document text
    • http://superazs.ru/images/news/file/31066774722.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-9-11/20210911211558215608.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/161519a9fcad1c---kaxizusufawezezilijamitan.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/pufuzilupuxomivetugi.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/15338425980.pdfIn PDF document text
    • https://aczv.fr/userfiles/file/42080323419.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/lebijavufolirebori.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/xajemidorisisuwowugapore.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/vigedaduxefazinegeg.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/74810153248.pdfIn macro / runtime command snippet
    • http://ei-windykacja.pl/upload/file/lubikikas.pdfIn PDF document text
    • http://gro-felix.si/uploads/4463731443.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f9634c2875---xufutazuwikewerekaxedotu.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16153ae3b007b5---98964402694.pdfIn PDF document text
    • http://b40555.handyfriendship.com/upload/files/siwemulagedofevo.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/sawubuvojadiwepizi.pdfIn PDF document text
    • http://partnercable.com/files/wofupel.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/35391126542.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614fef7842e0e---zafaf.pdfIn PDF document text
    • https://agatanorek.com/files/file/4341123521.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/motitazarasiwanij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=free+hd+movies+direct+download+sitePDF 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_off0000ad0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c51d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC51D 14924 bytes
SHA-256: 0b62c7a0a78eb820c979a39993b7a3d3b02eca3585bb4a496b7281737646f84e
font_02_sfnt_off0000eac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC9 10764 bytes
SHA-256: 23864ff96ccebaaaf033a9e3f6ff5052429dc516d08c87274aff7480e0670bc5

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