Malicious PDF — malware analysis report

Static analysis result for SHA-256 326ece26afc0e402…

MALICIOUS

PDF

88.0 KB Created: 2021-07-24 06:08:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f873b7d4bc844519b165437fa8085c96 SHA-1: 4c5e701caa32e7708371bc9d12d05d08144836d3 SHA-256: 326ece26afc0e4028715483267daa7f4e037218f0015b87ecdcd642fdf464fbf
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal or Forge Credentials

The sample is a PDF document that contains multiple links to external websites, many of which are hosted on compromised WordPress sites. The 'SE_MFA_LURE' heuristic indicates the document is designed to harvest credentials by requesting MFA confirmation or a one-time code. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or credential theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/1c2af194cb187064f4d95f59832b7353/14244530507.pdf In PDF document text
    • https://eyetracking.pl/userfiles/file/89321305031.pdfIn PDF document text
    • https://sambelteri.com/contents//files/ravojodi.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/lajulotuwemek.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776b6f62dd0---lukivamodededifuz.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160c96a88b9edf---wukusi.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb008ae6f3---gawewiresazoloronorizoti.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075662a479bb---lumazavuromutevopina.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607905760b104---tokadulivowubak.pdfIn PDF document text
    • https://agenziadiviaggiocagliari.it/file/sutorejow.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/8c4fbadfb04e4f78a120bfa9bfc99d94/39267292598.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/a0e3583f0f181c6256fe0f34dfe2e04a/bogevikujixitobakip.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/a67b54dfcc5acb3e273d404ab38c4a20/85601427818.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff8e6da11b---98742690883.pdfIn PDF document text
    • https://lemanssrl.it/file/belizoloxika.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160afad51422dd---motabunu.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/loxaxez.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9c78341441---83657821330.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/93c37f6e72ed0cc4b710db2b010cb342/mupiwigalirowedodug.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///66281037382.pdfIn PDF document text
    • http://samtle.net/ckupload/files/lixovojisivim.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/52a4b277125506b35f5a03745a0f26d5/pinixexezekifoxamimepum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+fill+self+appraisal+form+for+testerPDF 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_off0000f5f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E06 16700 bytes
SHA-256: 82c9f0f7fef17636f9ba077a58b28a4fd6d35bd9e7ee51549b780142f2657425
font_02_sfnt_off00013972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13972 10492 bytes
SHA-256: 8103a21ed9742ea13085904293efd22788c3181c9130b211678c8cff1991415c

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