Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc22faff8f79341e…

MALICIOUS

PDF

77.9 KB Created: 2021-09-03 19:48:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0d0e0f8a959153a93bedfe8d9863ae35 SHA-1: 8ea913a236c3a06958b85971bf8b8f133c2455fe SHA-256: bc22faff8f79341e0c34211215b1dcafb7a6c31a5e32aa98cc16051ed20224d0
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of numerous external links strongly supports the attack pattern.

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 https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/5nv6l2sjvt5bud4eq0g4bf0vhp/58469762733.pdf In PDF document text
    • http://alnadaoil.com/userfiles/file/58298704744.pdfIn PDF document text
    • http://ketoanaca.com/uploads/image/files/99594122333.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/ca9ej1p13n928b3breo2klja16/34689404096.pdfIn PDF document text
    • http://cuhs1981.com/clients/8/82/82ca37c076ec4232796cb58ed009bb3a/File/42699713743.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/83448167041.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/0d79c7f5b67f6eb3f0f5236928da8b59/jekubalerevibebuliwoku.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/23583427799.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d617934b01---21687638232.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/84539097161.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/i18lvuk8b76sv205tro9ufoll6/80315990897.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/65854146041.pdfIn PDF document text
    • http://mojahotels.com/ckfinder/userfiles/files/kawaburovoxotobudilel.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/8cc4010c7655bbe55be235fb34ac4b0c/90296682752.pdfIn PDF document text
    • http://aligokdemir.com/resimler/files/66880521576.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/17933026980.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160af5944adf3b---20276350866.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb4ac1fd2e---ruromilowiduludoz.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/sejalot.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/dc80c49c51a484d3bcf65d74a4a6eaea/nazidunerekegodiwe.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c924f42b381---movajisado.pdfIn PDF document text
    • https://dermatologie-chamonix.com/userfiles/file/vabupuvumenefagidopivasor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=faktor+resiko+spondilitis+tb+pdfPDF link annotation
    • https://tes-sys.com/uploads/ckfinder/files/20210825/16298959054256.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD55 10700 bytes
SHA-256: 5257b59cfad7193a6af6e17ecbf5272e0fb1820215a20684a8def144a481c9bb
font_01_sfnt_off0000e5bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fdcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCF 17160 bytes
SHA-256: 29e4a8313b9701e2a34f0d4d73b77819fa55d97fca1f3ecdc9ea81c2daf7f74b

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