Malicious PDF — malware analysis report

Static analysis result for SHA-256 80dccafa2d7cf57f…

MALICIOUS

PDF

113.1 KB Created: 2021-06-12 20:00:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 31cd43ff21dec31813f9a192dd19c39b SHA-1: c32424be3e40b267c22db87260fbfc17c9268fa2 SHA-256: 80dccafa2d7cf57f6fe6f43e8f031fb38098419d165536320e2ee63c5a7537ec
156 Risk Score

Malware Insights

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

The PDF document is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous external links, many hosted on compromised CMS upload directories or disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though partially corrupted, contains a title related to script writing, which is likely a lure to disguise the malicious intent.

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 https://garglob.ru/uplcv?utm_term=how+to+write+a+web+series+script PDF link annotation
    • http://pkynfe.net/userfiles/file/44077161087.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/77089181683.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/527aabf7852dfeed5d1913146c84cac1/41474403743.pdfIn PDF document text
    • https://actor-conseil.com/files/file/vomizafi.pdfIn PDF document text
    • http://huntland.hu/upload/file/96289567560.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/l2a92glqhve521at3c93e05ptl/ziminanopuvagipodisizu.pdfIn PDF document text
    • http://tfforming.ru/d/files/zedajononusej.pdfIn PDF document text
    • http://novichiha.ru/pic/file/54222989172.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bbece3e85c0---94967569138.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609162148f27e---93265210348.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210526085933.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcb6c51a7d---fizoduzuzuvekirupabelu.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/957d75e1e7f6b6d9e5ab2783dc1d22c9/55416442295.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/52594762609.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/87ea420adc3b5e30b7c047db8de7c168/10339311775.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/5249321c3d7da2ebbbf82e70445e543a/kunodaragejepenowedivul.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16083ae696a4cd---72165947627.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
    • 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_off0001723c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1723C 4772 bytes
SHA-256: 61ec4d07e06b4a58d0de350fa49de3c1ee9278396e47530e118e0b5e6c634162
font_01_sfnt_off00018289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18289 11276 bytes
SHA-256: 02b8014221931d259d31d955f994b18bd1e97f5eea3b1b4bb30bb2f740145f73
font_02_sfnt_off0001a8df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A8DF 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3