Malicious PDF — malware analysis report

Static analysis result for SHA-256 436d234ada0ab793…

MALICIOUS

PDF

89.4 KB Created: 2021-07-14 06:43:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e42d1573dac66de14dd74d03c68f3446 SHA-1: d5bc6a1cd5562940991878b349cdb72f5fd67881 SHA-256: 436d234ada0ab7936b4eb446afecff1c3debe004692c0cbdb0a3399789e9568e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm with numerous URLs, many pointing to compromised WordPress sites. 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 URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://guijek.com/userfiles/file/55848775405.pdf
    • http://moscowprice.com/content/xuploadimages/file/42954130757.pdf
    • http://e-skala.pl/userfiles/file/36771308516.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c89add1dbf---75367058046.pdf
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/85a1d2fada9c39348484ec5f0db26192/58838104684.pdf
    • http://emrc.ie/upload/imagecontent/file/gexumifopozodivori.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609825183247d---51792119099.pdf
    • https://binarbaidfabrication.com/public_html/userfiles/file/13915931753.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/7e24716422d5478d4c37e31866f918f3/972457380.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8bc54d0336000a58e59950110d212414/15662995012.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16087b4f7bf856---suwibokilevubipe.pdf
    • https://wonkingchina.com/d/files/jotaterajogupuvoz.pdf
    • http://laduses.nl/image/file/liroginadulitotakamefud.pdf
    • http://pc-driver.ru/userfiles/files/3219197516.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6ae706beb---62952652011.pdf
    • https://evergreencans.com/userfiles/file/bemukurizuw.pdf
    • http://maristaslardero.es/userfiles/file/53773004545.pdf
    • http://parvazyab.net/basefile/api203/files/gebeb.pdf
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/ea824adb4a3317e5e58bf209e3054cff/jidasizarumabok.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c2df005e287---1279310927.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160b5256db9fe8---74311250091.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/oislsvpkpaplkvbgcair2m9i83/50545827290.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091fade152ba---20724197944.pdf
    • http://beautybybelief.com/admin/images/file/31443919666.pdf
    • https://pasarantogel.com/contents//files/44191676841.pdf
    • http://istrouma1971.com/clients/9/9b/9b88b062b8d6af44b28e209fcb06d7d5/File/rimisurusilixalowulikoduw.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/8a2ed162aa464248a931ba5bb576b633/80628713280.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=best+street+legal+track+cars
    • 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_off0000fb7d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7D 16792 bytes
font_01_sfnt_off0001138f.bin
148d3192e6182f2d3a05d44fbc982f709412042be564568b2ea63c52a8d3dcc0
pdf-font-stream PDF embedded font (sfnt) at offset 0x1138F 16852 bytes
font_02_sfnt_off00013f90.bin
59b410f116a8ad5f72a03cb1b0e3e3da49fc7a8e07fe936d6af530e103bff04f
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F90 10236 bytes