Malicious PDF — malware analysis report

Static analysis result for SHA-256 45b86b53854232b3…

MALICIOUS

PDF

78.4 KB Created: 2021-09-05 20:19:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: aefea4bb1d64fea300231534face497f SHA-1: 6f90ed8aa61399e85c64bb2eaab6c9f14b1e9f73 SHA-256: 45b86b53854232b3066b5002deebffa8490a8bd6f23663b049d3896e257e5e14
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the overall structure and URL analysis strongly indicate a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://domgr11.ru/uploads/files/37592519679.pdf In PDF document text
    • http://sushikyototogo.com/uploads/files/692495147.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/c6c0cedb7d483fcc5e73bcb92fad62ae/43897480617.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/448b865e8cd386906f5483cbccab6498/lapapu.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b31555a9891---20752693605.pdfIn PDF document text
    • http://kennycojewelry.com/userfiles/files/202108/1629506865.pdfIn PDF document text
    • http://jiachuankeji.com/upload_fck/file/2021-9-5/20210905193038960886.pdfIn PDF document text
    • http://thienanglass.vn/upload/files/51663743975.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c75f53c313---xozosutitexudegimujopeji.pdfIn PDF document text
    • http://theleadershipworks.com/PO2/UPFILE/userfiles/files/pudokunik.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/11698321562.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/161027ef0af1f3---50802341024.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/83ca3050ee28dcd8f27c5122f0779df8/56466632576.pdfIn PDF document text
    • https://haidangpc.com/contents/files/70445526195.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/10861183060.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f44f7cb9200---wanemozexobojejimiwize.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e03b69cdd9a---sutidev.pdfIn PDF document text
    • http://seteo-dechets.com/images/file/85553732557.pdfIn PDF document text
    • http://castanienfamily.com/clients/74558/File/welaxovalipuberagolawa.pdfIn PDF document text
    • https://marosme.ro/hirek/file/vovixivedes.pdfIn PDF document text
    • http://mid-europe-ex.com/bavub.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/dee7f2405b284a10dc723379f2c9c25e/42886645134.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3258d92c0---67490701525.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/s9euo7jg797gu3jvtlpsal9i4h/raviwololopinefe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=ulcera+peptica+pdfPDF 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_off0000cdbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CE 18436 bytes
SHA-256: aeeb13ad351d4dd67fb6cea27dffb859e1273fc01889a35456ccf2996f943dc5
font_02_sfnt_off000115a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A9 10228 bytes
SHA-256: 70d81360daf875cffe32fbb327ef043178e9830bc96632c2b78035b74c1759b5

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