Malicious PDF — malware analysis report

Static analysis result for SHA-256 d001b838fa4ab4ef…

MALICIOUS

PDF

98.2 KB Created: 2021-07-04 19:12:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 24784c912a19f9052e1ca2d3b518cf1b SHA-1: b3830f4ef8417c2e2344bcf968bcf666674fa7f7 SHA-256: d001b838fa4ab4ef6262610e161b290ae5c9ff01ef4f894069cbcbc8d02b609f
156 Risk Score

Malware Insights

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

The file is a PDF containing numerous links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate maliciousness, specifically a phishing or malware distribution lure. The embedded links suggest an attempt to redirect the user to malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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 https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/a6a6a505b56788082a4ba8b0d9777e0c/66212947977.pdf In PDF document text
    • http://logtech.cz/foto/Image/file/lidus.pdfIn PDF document text
    • http://esistore.de/userfiles/file/90120833622.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/edb2a63350b988501004d034476a210b/tokowudite.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/f1db9e1f306f21b89024b26ad90f3b0d/44782100165.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/mevozefiva.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b68586ced---42735289658.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/wimuwisatozivewe.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071fbe7453ea---46605777196.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/saxibop.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608edc754146d---wojanadoxamogal.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/saviw.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/jivurovozilenutegisiwu.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aba15fab456---rolisajupafelitoriv.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/49148342710.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/126a8f2d113750eaffdb9a03906bcbf8/81876620857.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///85018162079.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/923f59eb9ac82a1ab218b2fc6b63225f/34334505847.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/o1r8ng7agnb8dphe4v3j4t0u3t/69919059459.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1607e753eec69d---11746057503.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/11810404649.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/ca828665f3183d9fab241c0c751d0f70/67000613286.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a960033e3fc---61907139503.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/65ff5f24f2101d0c6890ff85379eaf73/89635782813.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=example+of+a+secondary+groupPDF 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_off00011dd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000135e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135E9 16904 bytes
SHA-256: 8c4d4bad2ebc9e923c7a486a148dad1e1b5f019d2e8043cff33a3187fbc830f3
font_02_sfnt_off000161f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161F8 11072 bytes
SHA-256: cd07e45337f02a9b3b23115e7a110ac907614f5fec475bdd86cca3837adaffa4

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