Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d88ac993afd61e8…

MALICIOUS

PDF

89.4 KB Created: 2021-07-20 01:03:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 35c3a9d9f84608152470bb1b40c37bc0 SHA-1: f08e44d1b697d69443ea84146429146d0d81caa5 SHA-256: 7d88ac993afd61e87fe9b0402c44b83bb41bed1e537e23262f9e261dc463d4bf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of links, many pointing to compromised WordPress sites, suggesting it's designed to lure users to malicious destinations. The document body is unreadable, but the heuristics indicate a link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://stellamaris.cz/userfiles/54736746945.pdf In PDF document text
    • http://ahchala.com/img/file/17015348068.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/64416127808.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/276d4832dca681e0a67cad41f536eb55/37998751816.pdfIn PDF document text
    • https://dm288.com/slicice/file/womat.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/pujewuromigotuzezix.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/52227267552.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/080ea848aa9718982193a9924abb389f/xopijeronuzemadelefo.pdfIn PDF document text
    • http://drtamerturan.com/file/japibunorozewuzuwepugozo.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/u0taqdalhh5bv17geto2qpi5k1/jutevepovezinefawalugopi.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/c74928a2b864654ddb3906cd5686f418/gidenarul.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/raporixu.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/47737083852.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/90f41e80f665b5cb9bc2c4558a74ab56/bagemafok.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/20410e41d68d61134c795079978277b7/60939718394.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16081bf6622ee3---subiwejisexifupejekosos.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6f1e68b36---nuvumevojajuwevufij.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5974ceb6d---zerosuwurisi.pdfIn PDF document text
    • http://xn--om2b25zm6igqb.com/ckupload/files/43925079003.pdfIn PDF document text
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/46552597064.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/8540c39c58f091e5eb9183ce6cd6dd2a/58511562040.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=days+of+our+lives+peter+blakePDF 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_off0000f9df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000111f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F1 17852 bytes
SHA-256: c4e65a7c2ead20ce1c51a71842e41d855537d96bf92f7b2a09cbd0806a7496e0
font_02_sfnt_off00013ff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FF5 10760 bytes
SHA-256: 3e1230479e0165fc1732afca7a089df6ff132edc7f15045cb07b781ccad4f538

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