Malicious PDF — malware analysis report

Static analysis result for SHA-256 09a2164465b92f20…

MALICIOUS

PDF

76.1 KB Created: 2021-10-02 06:44:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1cd51b13ba5e5b953ba6125aa518611e SHA-1: f6be5846dfd95b4a051201e4f0ca9a50f604acb9 SHA-256: 09a2164465b92f200b18b11a4607bcc1672ba03f4d85b966cbfbb966a52f3fa1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress upload directories and other disposable hosting sites, likely intended to redirect users to phishing or malware distribution pages. The presence of numerous external URIs and link farm heuristics strongly suggests a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://philabc.ru/uplcv?utm_term=youtube+mp3+android+online PDF link annotation
    • http://pietrek.com/MARCUS/files/file/56359824688.pdfIn PDF document text
    • https://windfreeklima.com/upload/ckfinder/files/muxusumaremizajon.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153e7a354138---nezasiw.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/19612493597.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/36067871867.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/48711278241.pdfIn PDF document text
    • http://concilianavarra.com/userfiles/files/8594247797.pdfIn PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/gabapomuvu.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/81924917140.pdfIn PDF document text
    • http://ahknchem.com/upload/files/7203973601.pdfIn PDF document text
    • http://kdsonline.org/userfiles/file/38883685964.pdfIn PDF document text
    • http://thegioimaychaybo.com/app/webroot/uploads/files/6974270364.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/vibuxitudamokepisagop.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/ximemazakuliga.pdfIn PDF document text
    • http://www.tahi.hu/ckfinder/userfiles/files/20524264844.pdfIn PDF document text
    • https://www.speeddating.lt/speeddating/ckfinder/userfiles/files/49986951758.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe6f202b3e---lodosugejumefefowowos.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/pufinutogofevalirorudur.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202109221916081229.pdfIn PDF document text
    • http://baozhaopharma.com/upload/files/jiwuvugoneretonudaxetu.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/kanatipedijosako.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/7db6rook8pcfp42onpkeslsbo9/basexisujaxaxikewazus.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/22760100494.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_off0000be25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE25 10780 bytes
SHA-256: 2ead2bbc476bc6b5e157a1eadf757d7a595b5865d4525bef21469616a2c2dba8
font_01_sfnt_off0000d6a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A8 19872 bytes
SHA-256: 8c60e1847b19d7d1a1cbb7292f1822bb0ad762b53be2b2b44553e56e933adedf
font_02_sfnt_off00010ad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1