Malicious PDF — malware analysis report

Static analysis result for SHA-256 16c10ab64a191c7a…

MALICIOUS

PDF

81.5 KB Created: 2021-07-21 03:18:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7ba5c86e552c95d83ba61e0612c74cfc SHA-1: 1b7ab6ccb4902d6ab9f5755765853a002cb68e95 SHA-256: 16c10ab64a191c7a0b9342da3be376c7d7775b2d7dda705cafb68fa7028b5b10
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm with numerous URLs hosted on compromised WordPress sites and disposable domains, suggesting an attempt to redirect users to malicious content. The presence of these links and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://eternalbliss.net/file/sadoxozorafewij.pdf
    • https://lesartsdansmonjardin.com/userfiles/file/20210702231516.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6398347b7---vurabif.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f81e76f557---marum.pdf
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1609811694e7b9---nugofeditap.pdf
    • http://ats-dz.com/userfiles/file/navilarinulos.pdf
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f461363567---gubegujalu.pdf
    • http://mujuerp.com/uploads/ckeditor/files/20210609085320.pdf
    • http://hopkinshigh1988.com/clients/75739/File/zelubal.pdf
    • http://sonkertrail.org/clients/9/92/9260a3c387aed4615f72c72c3a1da295/File/61597994682.pdf
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/nudewaxiguroxef.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/6vjj2mv34ksq23c5ppb237hnm5/93547080594.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607369b370882---39259953054.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/a16ec07f0bbf8d1d93f1c66deec8bffa/56038668599.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a775e61441---24127140896.pdf
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/8b5e4fbb0795c0cc505e612959fd05eb/xivebezajobivukaronud.pdf
    • https://aucordechasse.fr/vosImages/wibibasivokovesagenowu.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/9be3de542954075cf1c5a1158970d314/xeraraxelosazebabekado.pdf
    • http://kartywspomnien.pl/uploads/assets/file/6905315573.pdf
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/89eae23de7c74144a8e57314f77c1589/gubutu.pdf
    • http://hamandeggsclub.com/clients/e/ee/ee862789ee8b59d3f3d22261ccc35c80/File/50525314552.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f109eb5a3---85778251421.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e88092cc71---68613239364.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=18+hp+to+kw
    • 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_off0000e007.bin
f3d65948af484be2c037180754f408749bce690385a4d09a9f72172d61146314
pdf-font-stream PDF embedded font (sfnt) at offset 0xE007 16768 bytes
font_01_sfnt_off00010ba4.bin
9d83bbc9102f8616e237a51361e8607241638a69c71ed8a3841cf5cf752eb16b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA4 9888 bytes
font_02_sfnt_off000121a5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x121A5 16792 bytes