Malicious PDF — malware analysis report

Static analysis result for SHA-256 7166b7bb5b18f1fa…

MALICIOUS

PDF

81.0 KB Created: 2021-06-25 10:16:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 70c3257ea00ebb45f5b5fff59cdb2d81 SHA-1: e44137a4cda664a854f6d607e0b439f1f3e44e2b SHA-256: 7166b7bb5b18f1fa6a4dc6b2d3c55d80b7aab07a00e58876186a205755e15a8b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a46e9cc9b16---19113430015.pdf In PDF document text
    • http://birzebbugastpetersfc.com/files/file/56012855392.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608072fdd54a0---lumifufekobobakajiwusawos.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/d654e0251f94ab32620d716b572b1020/jejevegepufiz.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/galinufesoliwudafelejudo.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cb89fc094f8---soxawidajomafatujiwu.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/2526877011.pdfIn PDF document text
    • https://arerp.kr/data/file/%5C/46308293242.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc60a34536---gedevakagusuletaf.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/78c07d7bb2873ace3ee024e2693c1120/gojepabajulinaxarin.pdfIn PDF document text
    • http://simonide.org/userfiles/file/70092909886.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c982605656c---983235273.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/6977544365.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/35211014842.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070acb262957---46216544106.pdfIn PDF document text
    • http://moda-minulosti.cz/docs/momin/file/51144826168.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16078ab32d3ce8---48959322998.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=decade+counter+countsPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E3 4732 bytes
SHA-256: a488e036dc6e01d1719293e0d53628286fe43fe99b717c61ac77e990fb86edae
font_01_sfnt_off000104f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F9 10704 bytes
SHA-256: 0869c1dcd7617fe756d4f1495a149fcdf8d7a16ced4b8d6abe9a8e9ea0085a83
font_02_sfnt_off00012923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12923 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3