Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fa9208075f40a73…

MALICIOUS

PDF

70.4 KB Created: 2021-09-01 02:09:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 589efa965f623871aaeba3181a1f83f1 SHA-1: 92f9b3e9a6e3c227a95aa3066bf90d3cfec7710d SHA-256: 4fa9208075f40a737272ce59ca131468e8a504d2184f68195dffa690fbfb9950
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various websites, some of which are hosted on compromised WordPress installations. This suggests an attempt to lure users to potentially malicious sites for phishing or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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 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://avs-market.ru/admin/ckfinder/userfiles/files/26659889175.pdf In PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/36660646757.pdfIn PDF document text
    • http://herve-coiffure.ci/files/kizijuxu.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/igk2e5kugvq32amtl8aj4itv2j/5700808985.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/lanafenupin.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/aqkbpp68a29ai53grachghofu1/11876839406.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/vef00hmo305btn1c287t9pleph/pusudugaximugalok.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/94149b25eab6bbede1eb96f0c7b82225/jujidogoraz.pdfIn PDF document text
    • http://ciskmv.com/css/file/pexezolevajixe.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/nekowogetuwasajoguvos.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/071118057c1a909909200965964b271f/vefarazixozigesedizime.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/dofovafebixigasiruloz.pdfIn PDF document text
    • http://www.heksan.com.pl/file/nejekerepilojuwuxuve.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/ronijanod.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/b3bc49a79cdf36961103e85a092b5b33/wimilazixesunomanulijo.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/mizirotasasekesit.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/59187673728.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210717_A6F1C12AEE711C59.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/63426402998.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/rganm31o5ni7cu1o228mi60t57/kuwisiveg.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a9bb7ab540---36692775631.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/56837078065.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/lt0jnsl79k0l11jrcns0kscqks/wuvexagal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=critical+ops+free+skins+mod+apkPDF 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_off0000b78f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB78F 10904 bytes
SHA-256: fc9c037590f0d616ffff81e03ae1ad3b26652e4bedd47359dca6a6640ee54cbc
font_01_sfnt_off0000d0cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0CF 14200 bytes
SHA-256: 1e2c8e7266cc5ed778d8fa7b14194ca3f49f5c0eeaefa1b1da4f6f6a1a882072
font_02_sfnt_off0000f44a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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