Malicious PDF — malware analysis report

Static analysis result for SHA-256 f551d94284c03b7c…

MALICIOUS

PDF

86.3 KB Created: 2021-08-13 23:01:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ad68c97b7380539c7b64ce71b47a84a4 SHA-1: 374b18386cf96711639540cb45c955b5df788892 SHA-256: f551d94284c03b7cdb3a029b89c7ba8d1a87e701557f0a4052bac04f223aeb04
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or are part of a link farm hosted on disposable domains. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious sites, potentially for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://armanetti.com/images/3386937782.pdf
    • http://stinpo.com/ckfinder/userfiles/files/39944218324.pdf
    • http://bielle-srl.com/userfiles/files/kigugenipemizajovi.pdf
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff2a79b49f---muderavibexotajerejajij.pdf
    • https://pomacanthe-art.fr/imagebeforeafter/files/pawulovomi.pdf
    • http://alibabashipping.com/userfiles/file/vezuripowupubas.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077337740783---15781799870.pdf
    • http://ever-pioneer.com/upload/files/59068646026.pdf
    • https://essaidafm.com/uploads/FCK_files/file/wovemivofakesusavuwosed.pdf
    • https://vigiweb.cl/dinamicos/files/file/42672780346.pdf
    • http://ballarioarchitetti.eu/userfiles/files/fosuzejel.pdf
    • http://tanphatinst.com/vietkiendo/upload/file/vinatudiligefamifej.pdf
    • http://security-m.jp/tool/images/file/voxawuvoxejipiran.pdf
    • http://15fratrowreunion.com/clients/2/2b/2b18ccadde375fd95e9ac2d5db5aaa67/File/buvozetipebinavaroxotiw.pdf
    • https://beldapin.com/calisma2/files/uploads/dorulemexobireragop.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608612a71678c---19658818468.pdf
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/ffc5d54613772fe551663037d52fd8b9/42190459738.pdf
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607e98b347eed---97924501050.pdf
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b2f565f85---bomados.pdf
    • https://onlineadda.net/ckfinder/userfiles/files/78262562522.pdf
    • http://sgpeo.pl/users//file/3269041035.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b24f9498408---gibanenozovodozuwe.pdf
    • https://netshopnepal.com/userfiles/file/gojowonekesewejog.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071f2c6684c5---vaxinakaxedevuwunaforufe.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+i+get+a+copy+of+a+police+report
    • 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_off0000ed1b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xED1B 16792 bytes
font_01_sfnt_off00010532.bin
af4b6dd07d557a1013f10ac270f5c4d560a807aa171e2f04f72734983e42ccef
pdf-font-stream PDF embedded font (sfnt) at offset 0x10532 10576 bytes
font_02_sfnt_off00011d86.bin
ed605b68838fe2297cc3c02cb4bd4761b4ee8c82c1362143e11281278057d433
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D86 17380 bytes