Malicious PDF — malware analysis report

Static analysis result for SHA-256 473166cc97ba01f6…

MALICIOUS

PDF

79.2 KB Created: 2021-09-07 05:05:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b3c1469cd08b6d078993cf9d48167790 SHA-1: 6cb22e199fc91e89a51e596547998e7ca2d11c00 SHA-256: 473166cc97ba01f6526b4c803dde3eead539a2853915db1dcb5f45943182dc73
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It functions as a link farm, with numerous embedded URLs pointing to other PDF files hosted on various domains, some of which appear to be compromised WordPress sites. This suggests an attempt to manipulate search engine results or distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://queure.ru/uplcv?utm_term=problem+solution+essay+format+pdf PDF link annotation
    • http://luatsutiengtrung.com/app/webroot/uploads/files/90184146096.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/wamun.pdfIn PDF document text
    • http://embeddedhr.com/ckfinder/userfiles/files/duwivonagarimekijememu.pdfIn PDF document text
    • http://33podarka.ru/pictures/files/sinunedunanowazan.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210801142033.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/15921103202.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/d8277658766205157908869ed58e0f55/pejevafesudij.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/161140a603c972---folepa.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/55990665525.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607908d083ee8---fanujupe.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0ef1b08e1---vejatev.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-6-26/20210626141552879475.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160d55b67be622---dujinotusalijoxi.pdfIn PDF document text
    • http://thepducphat.com/upload/files/17039366904.pdfIn PDF document text
    • https://airshow-bg.com/file/86634335749.pdfIn PDF document text
    • https://ddnepal.com/assets/userfiles/files/38436615795.pdfIn PDF document text
    • https://ooobelkom.ru/ckfinder/userfiles/files/59492992792.pdfIn PDF document text
    • http://www.rannatennis.ee/data/upfiles/files/8123149551.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/22657092818.pdfIn PDF document text
    • http://vhktn.at/images/content/files/1807182676.pdfIn PDF document text
    • http://ahchala.com/img/file/pepasamagino.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/60a7a4bc2d1fb9390e947bc017b59d70/newufewupuruvisisu.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/v8q8iiib5bhojqff2t271k2cpc/dabagomol.pdfIn 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://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_off0000cfb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB0 11012 bytes
SHA-256: 3cb13a7da06c2e1e9913fc5b2a2830e53f6e33603daa34f6c79f6dc56181078d
font_01_sfnt_off0000e914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE914 18080 bytes
SHA-256: 867f28689778877a1343823aba183befeb233e598997ba2f07545655de9bc910
font_02_sfnt_off000116f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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