Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f10d5cb961cf0b7…

MALICIOUS

PDF

102.9 KB Created: 2021-09-08 10:10:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 475213c87f7a1ab8acbe73b89815dd40 SHA-1: af8799242b0527ae25f3498018b1ef7143e2e1e3 SHA-256: 6f10d5cb961cf0b7017c02ca313c10955e93cba5a9a314413baf10580e8cbaed
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and a machine learning classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The PDF structure and embedded links are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://medvor.ru/uplcv?utm_term=transactional+analysis+theory+pdf PDF link annotation
    • https://mlbcsimleague.com/ckfinder/userfiles/files/26974029550.pdfIn PDF document text
    • http://iltorg.ru/upload/file/24354066871.pdfIn PDF document text
    • http://atomleasing.ru/media/File/72494237038.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16082572c4af41---zusasosimu.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/68515502374.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e225dec43---12541301573.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a32c10fe59---99350641895.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a430e0ecde8---58334866917.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/xedes.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/tmots8ooskjj50399d06luojks/lalabebitivofuxuf.pdfIn PDF document text
    • http://hhoasis.org/app/webroot/img/fck/file/nolivapuji.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/31527870535.pdfIn PDF document text
    • http://bouncebodysupplements.com/newerac2c/userfiles/file/39597473175.pdfIn PDF document text
    • http://minhvuongthuphap.com/upload/ck/files/fibikulogabuperizuw.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/pavapobaso.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160966faf5fd1e---lamokitafexejuvezip.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/8cdf7db669f32a207e88de186ef9457c/vivuxedizorozigol.pdfIn PDF document text
    • http://nappsa.org/userfiles/file/zolino.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/e8a0d22241830d78d163996abdd61469/65756383299.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074162ecd84e---juzuzekimegiga.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/8bdcee19b1b44327bb155617f4052651/18333182068.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_off00012bc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000143d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143D8 10796 bytes
SHA-256: f35c3646e2711c55272c942105dd5c1090dce20615ee4fbe8a2553c05b84f5d1
font_02_sfnt_off00015ca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CA8 18796 bytes
SHA-256: 78dc356adf732ef25ee1f4b4b5ab3bc4c4de28654119589ed5a37e8d034e586b

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