Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9fa5282363c0af7…

MALICIOUS

PDF

87.5 KB Created: 2021-06-28 07:58:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 772e71cd3765ad422a772fad3c5d90b2 SHA-1: 4e20544ef8549f6754f53635c9da37f630681aa7 SHA-256: e9fa5282363c0af71786bd24267be514c686e0fe76e12f3821d0846012db4eb1
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to other PDF files hosted on compromised websites, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload. The file's structure and link farm behavior align with common tactics for distributing malware or conducting phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://servmed.net/userfiles/file/83469144407.pdf
    • http://shsclassof1959.com/clients/a/a7/a7a82b2a6025f7fafce5d77be70bf845/File/wujokubib.pdf
    • https://poolpoint.be/uploads/file/vevuj.pdf
    • http://beateromer.com/bilder/file/71273518856.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a14055b72a9---91978601995.pdf
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/c98b087076c333e56d12a356d646cbb1/8182423004.pdf
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/1bf3813fe7791a1a9421d561870b6ab7/dozumusevawofodemevexog.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dddaf3c379---92055400435.pdf
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/woxikebupelufilonejug.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/6ee8faab81e4a712a7e6877b7d6d628b/zopatugax.pdf
    • http://bannermaul.com/userData/board/file/rovamuxevu.pdf
    • https://varbackaforskola.se/ckfinder/userfiles/files/6296211999.pdf
    • https://atraba-holding.com/userfiles/file/bibewigagogaduji.pdf
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b69d1993d7d---zodubaxikenosatawonutarot.pdf
    • http://lyzebrno.cz/userfiles/file/bivigikubojidodekiwosi.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c100880515d---54235895333.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d17d147d64---79015977783.pdf
    • http://murasakijr.com/uploads/files/sipumedogax.pdf
    • http://refpecsbelvaros.hu/kepek/files/35334841538.pdf
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/ck83hmijskjcbc3tuqqiqnsus7/pumar.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4ea18ac70b---13752805919.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/a40a7b7c66ddee1c69e6429eae51fda7/lukatef.pdf
    • http://kme-kme.cz/files/file/2169984692.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+many+countries+speak+english
    • http://e1pl2.nazwa.pl/busy/fotki/file/geretejemiwizajozukipu.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_off0000f0fb.bin
24f9acc6244269bebffbdac1dbb2a603374d7210103ee36d96f1f10e97679915
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FB 11204 bytes
font_01_sfnt_off00010b0f.bin
250380681c8e4d1eb2be03efd714f26e53f5a431337698f74508cb1dc4ea716e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0F 17792 bytes
font_02_sfnt_off000138ed.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x138ED 16792 bytes