Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee59324206bbcc39…

MALICIOUS

PDF

94.4 KB Created: 2021-07-18 04:05:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 70ae1843c9c9d1e47f2ac124f507e3be SHA-1: 0acdf6fac5afdafdb3944ad0e952b648702c9031 SHA-256: ee59324206bbcc397ba525586fec6784800cca8dc7dc20def5515b4f86344c0b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting. Heuristics indicate this is a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/284b17cc69b044e944585780cf037c0f/biparojojadinuzaxaziz.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9d66014f3---19417153010.pdf
    • http://nct-vn.com/userfiles/file/35529499139.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/cq6mdei86atq7a6buhgtp41t4u/52151368337.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb29f258a1---67086693501.pdf
    • http://bukharasuwanee.com/sites/default/files/file/lowopikedofetof.pdf
    • http://cokhihoangvinh.com/uploads/userfiles/file/21579156546.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f18e5add9---34612544689.pdf
    • http://vladjurnalist.ru/archive/file/lifajatotetufexadeti.pdf
    • https://alkalacarservice.com/public_html/userfiles/file/4996648759.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160b49925359a7---perepilazopagewalonemu.pdf
    • http://safaraval.com/basefile/safaravalcom/files/sivariwewujopuxetiwuziso.pdf
    • http://starrwindow.com/clients/863399/File/valutudaxiluxaxateladexa.pdf
    • http://palenice.net/obrazky_clanky/file/60960098387.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609325e159e14---xekuwewotonijajejodupopej.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f35baea36c---begajiwosawipuwaximijudif.pdf
    • http://www.vegagastro.pl/upload/file/rigodazejisaxujezelo.pdf
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/b6eis0n3hs2ctsrgecddclap41/32429840977.pdf
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2cb5a0d67---90309585867.pdf
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081957bccb78---liwigowunuzezefosiloze.pdf
    • http://northstarbaptisttyler.com/clients/a/a4/a4b4c2e389351fb2dee96c3f727c6a57/File/jekirevexokeme.pdf
    • https://cam-ceeds.org/ckfinder/userfiles/files/fotixaniki.pdf
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/01a534559ebd77175e3f5becd0232edc/53389017160.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=what+is+my+dad%27s+first+cousin+to+me
    • 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_off000107bc.bin
c27b0bc1bf970ce5645f5a8e5c5a49a3774d919973aea4841cdcd486fe6e0186
pdf-font-stream PDF embedded font (sfnt) at offset 0x107BC 10936 bytes
font_01_sfnt_off00012103.bin
f0909d9aa472142651bb0e9d7e04b8b03dca1dcc24e68d51b4c4fdae5d365e03
pdf-font-stream PDF embedded font (sfnt) at offset 0x12103 18632 bytes
font_02_sfnt_off0001528b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1528B 16792 bytes