Malicious PDF — malware analysis report

Static analysis result for SHA-256 d06b882bccb0611f…

MALICIOUS

PDF

70.6 KB Created: 2021-09-08 08:13:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: c94850a1613caebe681d83a0857bcc43 SHA-1: 62f5cf3a838ce8a33359c6a900954fec42aade3e SHA-256: d06b882bccb0611f7b2175cb258029752c70abceb247f33efb08e7d0d5784821
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://smidgel.ru/uplcv?utm_term=check+mark+symbol+alt+code+in+pdf PDF link annotation
    • http://cartonwrappingmachine.com/userfiles/file/rebatufozat.pdfIn PDF document text
    • http://consade.com/userfiles/file/fokalebipezuwekaveguwasiv.pdfIn PDF document text
    • http://alacarte-grafik.de/userfiles/file/70053291483.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607db0fb04c3d---88125466093.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/784d4fca54879d23df8884221dc56158/22668435299.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/0ce4ee402cf93c465b1fe4b49cbfbd08/18165366810.pdfIn PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/nisixisosekomukobutimera.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/tafimaguwogatijefe.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/797beb0b4dfe9b891b5a19bd26948976/weveveponixekazuvumejuwa.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c163a6dbf21---25633154634.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba084ed541---wavasewikajexudon.pdfIn PDF document text
    • http://learningkey.org/userfiles/refutod.pdfIn PDF document text
    • http://discus-rus.ru/upl/file/gizotupinun.pdfIn PDF document text
    • https://artinterior.bg/userfiles/file/videlirut.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/96e600572bfd07b0f890db9d5d0bab3e/11812263083.pdfIn PDF document text
    • http://cabanagarden.hu/editor_up/19963869107.pdfIn PDF document text
    • http://aci-immobilier-douai.fr/userfiles/files/pudipodok.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/71070713071.pdfIn PDF document text
    • https://triosms.com/userfiles/file/lidexanosu.pdfIn PDF document text
    • http://epsilonsigorta.com/files/86703044765.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160787256af8d2---40080675920.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/26537687789.pdfIn PDF document text
    • http://alkanboya.com/files/file///2866382836.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073752a6af90---41105627754.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609d6dc96d12f---8399092451.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b5d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5D7 11260 bytes
SHA-256: 3eca0325caace2fdd1c4bc677146c6159a65466aee048b563ba527b478f78148
font_01_sfnt_off0000cfe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e7f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F5 14760 bytes
SHA-256: 69503509ce2c7bcde2099357084c20b5b3d7643ca33ed5ed7f11a08887d5557d

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