Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f45ba682a449eac…

MALICIOUS

PDF

68.0 KB Created: 2021-09-16 21:27:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0063a7bd0b2cbc0f20a5505c96a1bd7a SHA-1: 93f542805450d84b30301393982ae0a98c9e3e18 SHA-256: 4f45ba682a449eac7e91119768aabfde77af1db70ec973ea6758a90cfa591499
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that form a link farm, directing users to various external websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of compromised CMS upload links suggests a tactic to host malicious content on seemingly legitimate but compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://crewmak.ru/uplcv?utm_term=alexis+pie+icon+pack PDF link annotation
    • https://majorsagilekvaros.hu/uploads/file/88384538873.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161371e6d7a45f---refegowawirokelivubozez.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/96314520428.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/deranugutuzatakipu.pdfIn PDF document text
    • http://ardeche.proximeo.com/ckfinder/userfiles/files/lavugipov.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/naqbfc99v8nmvm3lgk61ngc5v4/28500924960.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/a7f6ac0b8ad4060babee2f5b2b9b24a2/79882936029.pdfIn PDF document text
    • https://onthespothousing.com/userfiles/file/47601180519.pdfIn PDF document text
    • https://brianspradlin.com/userfiles/file/xevaro.pdfIn PDF document text
    • http://anquocrealty.com/uploads/image/files/52972240379.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/10811312204.pdfIn PDF document text
    • http://tl-maskinfabrik.dk/userfiles/file/kejiladupuv.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.com/upload/files/gimefuwurabesujed.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/latomuji.pdfIn PDF document text
    • http://helloslow.com/data/userfiles/files/mebomadelifodipeluxopimol.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///tisulabipapuwamam.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/b8a1f85ca3f6ca32ed928d2c14ae3434/66897258358.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents/files/88375165238.pdfIn PDF document text
    • https://marsanz.pl/uploads/fck/file/maxawem.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/fabagulupi.pdfIn PDF document text
    • http://nuuts.mn/uploads/assets/tetulegu.pdfIn PDF document text
    • http://jinsonmetal.com/Upload/file/7712942320.pdfIn PDF document text
    • https://rajatotogroup1.com/contents/files/lovokinoji.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/kiloxifosuj.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_off0000ae9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE9D 14892 bytes
SHA-256: c8178ad1e771ce27006317fee54881ededa484a09d8673256d20d48fe48d4540
font_01_sfnt_off0000d2f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F9 10344 bytes
SHA-256: 6f2887d75b064d3807f57bc85a592a27ccfe9893b22a3a30977542033001407e
font_02_sfnt_off0000ea7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1