Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3bd0aaa32e64a5f…

MALICIOUS

PDF

75.1 KB Created: 2021-09-02 19:53:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 820d821d664f5830379a0ca92e9c9199 SHA-1: f83ec56f5350a56020894059c1c54b3d6a94f088 SHA-256: d3bd0aaa32e64a5f14d8de5a5968b544e26bc9b6f472bc8b4de4b49cdcadd82a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://medvor.ru/uplcv?utm_term=reading+strategies+anchor+chart+pdf
    • http://svaz-podnikani.cz/files/file/44055651155.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e8906b82ac---gawosizemaburezaz.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608561d8f026e---tosakaradexipubuzab.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e7db239df02---murivigeperunozi.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160849d8c595c3---7542176807.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/llfkm60qto6jshso4k0solstgp/5179068796.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/eb6087f9683121dad145c06cf2e26b66/42999360710.pdf
    • https://unitedfightalliance.com/ckfinder/userfiles/files/mufutijirunemakinavewupod.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce7069f4e6---molisosujisenomiwubagefu.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8d03bb93e---safunirevino.pdf
    • http://alphabodysupplements.com/newerac2c/userfiles/file/gesinurugikedenuviv.pdf
    • http://nanumed.ro/uploads/files/6372126521.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/161260f212a139---foxikaxomonawaxanezukex.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ad6d0e68e---53026646529.pdf
    • http://steps4cancer.org/clients/a/a7/a78c374070a178914b502abaf3db82b8/File/biwutuvodaxureke.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086e8f16434c---57151967146.pdf
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/fa3fc4ac7b8c84ef85693a565d26a11b/giwulepapomajo.pdf
    • http://unityproductions.com/upload/files/47887329791.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ffe60d6e4f---49171029158.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1720ae383---sabazikifavuvamuxilap.pdf
    • http://polyalpan.hu/_user/file/95187937303.pdf
    • http://lecieldesandes.fr/ckfinder/userfiles/files/wexisuvedeb.pdf
    • http://primaneighbors.com/userimages/zerolaju.pdf
    • https://al-farh-iq.com/upload/userfiles/file/59967033818.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c1cb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC1CB 16792 bytes
font_01_sfnt_off0000d9e2.bin
b1cebff3e757d98c93fc27547cfa13667bca66232475f2e36ad48261a9843b2f
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E2 10896 bytes
font_02_sfnt_off0000f2cf.bin
f14da7d17f0b31799e1f4b6aeba14364c0b792a60ede6a5d533598f9bb2a8a6e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CF 16956 bytes