Malicious PDF — malware analysis report

Static analysis result for SHA-256 a10cc15a9dc4f74d…

MALICIOUS

PDF

72.0 KB Created: 2021-09-01 13:26:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: dd229817131ae811a57066a41647c575 SHA-1: dfb921f0ac2cf4013910724af7b04aeebe27c2b5 SHA-256: a10cc15a9dc4f74dfd2cf1d35d53ca83afda2573b5054f35b8366645255a2097
154 Risk Score

Malware Insights

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

The PDF was identified as malicious by ClamAV and an ML classifier, containing numerous links to potentially compromised websites. The heuristic firings indicate the document functions as a link farm, likely intended to redirect users to malicious content or phishing sites. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific user-facing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5474

Heuristics 5

  • 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
  • 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://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1606cab9809d6f---99481442176.pdf In PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/lapovaselirowizunovozig.pdfIn PDF document text
    • http://www.victoriousintl.com/new/resource/files/61160521582.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/19393251222.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/rexikubemaz.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/0afe1c1dm6kn2c27v57lkf8mti/73644613068.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609bebee477d1---55192880824.pdfIn PDF document text
    • http://anjilh.com/uploadfile/file///2021051414570464.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/1ka134udelnb1556929lh9ecim/misexavotigiko.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16075de991bbd3---japabedobetakej.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082787141289---57113240255.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/702d6aba71a93490e3ebbd98fa6bfb43/nixakuzojada.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/vodugemamufeno.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/jawerofaxix.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/anb4ml2jcmkl8110cfq7oqnn1v/fekefozogirujetunasejeniv.pdfIn PDF document text
    • http://lica-mpt.it/userfiles/files/gixoked.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/20786844457.pdfIn PDF document text
    • http://moderncarrent.com/user_img/files/gigoja.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/62953329924.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/82708818299.pdfIn PDF document text
    • https://worldmedglobal.com/userfiles/files/47457282944.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eff54fbdcf4---fopuwaluteg.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d9b92dac95a---70356027203.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+calculate+p+value+from+z+score+in+excelPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000deb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB3 11044 bytes
SHA-256: bfe7b340e570a499c06eadfeb54c9f6a218d85ee8920f73146099341760a1f84
font_01_sfnt_off0000f879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF879 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1