Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6589ba9901a7103…

MALICIOUS

PDF

74.3 KB Created: 2021-06-20 01:14:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 752477099020aaedcc0b3bddbe18032a SHA-1: b3cf2aa2d5aaee61f8d1339d02d04fd81bb83b76 SHA-256: f6589ba9901a71032db9eba1d77e745692d6e06cd498913e992a4e58592cb72e
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents attempting to exploit users via external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oniceh.ru/uplcv?utm_term=background+images+for+photoshop+editing+hd+online+hd PDF link annotation
    • http://ranaghatpchsschool.org/userfiles/file/kuxadowivemo.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16093cac2b003f---lisiteputizifafaj.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/16131090277.pdfIn PDF document text
    • http://bethtikvahevents.ca/clients/2/20/20a91c0cb94b02964b0d1c5d980f1596/File/rarafoz.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/69894517253.pdfIn PDF document text
    • http://goldmustang.ru/files/files/xowofodawitipudafumipik.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/5v1ji49706o2p7dtpqmbrgfed0/84850730890.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-4-29/20210429122857646153.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/51c801d5e456df23b0a9e2de7c17ca2f/jamosed.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/87a00e00bf25a0c1bfb7a36931073538/gefezubafaboxameni.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/fu2tbqjcg8khaovl9d6rc26ts9/3743279398.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/jigowujegukaped.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/bb56927a4773e65c1a891e8d69ddabd1/zepopotefobajevasumi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE264 5684 bytes
SHA-256: d26c2422b12e4e737f58467b61ac788819e1524353dcde51ab2d1afd9653a340
font_01_sfnt_off0000f596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF596 11624 bytes
SHA-256: b2b448dfe8d2b5e8febf3602a3a6d0c5eed9746334fc2d739b381ba8848c8f26

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