Malicious PDF — malware analysis report

Static analysis result for SHA-256 a957381502fbeb19…

MALICIOUS

PDF

70.1 KB Created: 2021-09-30 10:50:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 89c3159ab3e3e6d137975101070bf01c SHA-1: 27e728efbb18bef81b1e87278978ebb6c27e755d SHA-256: a957381502fbeb195adea3f12f02b9154fbd8536a41c957e86b567c35ea1809f
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were extracted, the structure and URL analysis point to a common tactic of using link farms within documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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 http://www.cenlajobinator.com/siteuploads/editorimg/file/laminuwer.pdf In PDF document text
    • http://rebizplus.com/userfiles/file/69889965619.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/51011996997.pdfIn PDF document text
    • http://laduses.nl/image/file/30458688445.pdfIn PDF document text
    • http://xtra360.net/campannas/file/rifafizogobilonojidaf.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/dalubekukoxaret.pdfIn PDF document text
    • http://eternoohydro.com/d/files/65877825928.pdfIn PDF document text
    • https://quanticabtl.com/cms_2018_quantica/sgi_userfiles/userfiles/files/ladixug.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/59144430265.pdfIn PDF document text
    • https://newfrio.com/userfiles/files/54146315305.pdfIn PDF document text
    • http://azstorestudio.com/uploads/files/8483333995.pdfIn PDF document text
    • http://menifee.hanasushichoice.com/uploads/files/19568807676.pdfIn PDF document text
    • https://7mark3t2-7aya.com/contents/files/79629176020.pdfIn PDF document text
    • https://dhesient.com/media/72535427489.pdfIn PDF document text
    • http://ventmetal.ru/userfiles/files/88144284810.pdfIn PDF document text
    • http://bmfjhjk.friend-match.com/upload/files/95481467532.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/vijejazubelerinijazejanux.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/57072475908.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16140a10006aca---60992995378.pdfIn PDF document text
    • https://tsolisp.com/files/file/80598161736.pdfIn PDF document text
    • http://contelex.it/userfiles/files/nasex.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/19336240863.pdfIn PDF document text
    • http://proxima-design.cz/files/file/sesitaxuluvol.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613b35c033185---juxabekakirutunudebupin.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6f7978eaa---9199981880.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/vuviwebokuluwonikeba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=android+beta+programPDF link annotation
    • 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_off0000b3c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3C0 15528 bytes
SHA-256: 72304d208d916396b3f02ee9490da0ba98670890e6b9d26e484d9f7d42b728fb
font_01_sfnt_off0000dabe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABE 10640 bytes
SHA-256: eb183a50068224df2bc4c8814edf6a0d3b09dca04a99c6922b7afbdd5167cf9b
font_02_sfnt_off0000f2a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1