Malicious PDF — malware analysis report

Static analysis result for SHA-256 10acb9af62b74d72…

MALICIOUS

PDF

73.3 KB Created: 2021-08-25 03:28:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bc60d2438fb628213ba3c4cf9da54e1c SHA-1: eb55c6c20400630085a4b5ae0780a1d4c1c07c82 SHA-256: 10acb9af62b74d7207ce91db43d71dbce2171382d2ae5308dd277fc80421f101
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or phishing lure. ClamAV detected this as Pdf.Phishing.Trojan, and ML classification strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malicious redirection campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://cructi.ru/uplcv?utm_term=02+road+king+for+sale PDF link annotation
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/j8m11b8uffhugd14ut08tahj54/82231672718.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/25110345008.pdfIn PDF document text
    • http://health-bridge.in/upload/file/11415364770.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e9747c0c9---27046319784.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/totomofikafatadodemabapab.pdfIn PDF document text
    • https://krone-murten.ch/userfiles/files/54810724990.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/vuwugitomonejas.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16098ae08668f3---kutajadenepiveguzojaj.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/9627200352.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/27995844746.pdfIn PDF document text
    • https://doctornhospital.com/banglanews24/editorsfiles/files/moburanikuxoliv.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/ib6an78v9vdpd7st1pgbmtqcr6/18510615751.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/4eo92pksefovepeed03hg8aiq1/96107973770.pdfIn PDF document text
    • https://actor-conseil.com/files/file/xowadufof.pdfIn PDF document text
    • https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/jdco1vvmg369k2pp6hjd138147/tubodanumosibosigutefu.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/puxemuxawik.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/detijuwipetemu.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/30654012086.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/891098818.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/xafesefuvo.pdfIn PDF document text
    • http://hotelbelleepoque.bg/userfiles/file/wetupewopudavogexogupele.pdfIn PDF document text
    • http://d4smontreal.com/clients/f/f5/f58105ca183540932673f5bf18e62671/File/pimutewanidewarolu.pdfIn PDF document text
    • http://www.toeterloeh44.de/files/gufitokageditetexiz.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/84354193353.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_off0000bc3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC3B 16620 bytes
SHA-256: 8656c2bf3e44e687bca25b7ff0552e624cf817dd504ca3fca83c0ad194e0a6ce
font_01_sfnt_off0000e722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE722 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF39 10668 bytes
SHA-256: 5b9491c4dfb82093b3185b1f7348e2bd6c4eca0f82162df27ce2e1e8dfa86b70