Malicious PDF — malware analysis report

Static analysis result for SHA-256 78d6dcd80774a67f…

MALICIOUS

PDF

97.4 KB Created: 2021-06-29 13:34:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 89057dd5e36996a3af1c661294dc4927 SHA-1: 4b306d4d72abd1a97991f56a974c6827ef0938c6 SHA-256: 78d6dcd80774a67f25bf716b3d061ae4a35a3d92dbf0441eaf78a8d4b320c3ae
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution intent. It contains numerous links, many pointing to compromised CMS upload directories, suggesting it functions as a link farm to redirect users to malicious sites. The presence of external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 http://tomlitkom.ru/ckfinder/userfiles/files/gitodiwowodulotivilejas.pdf In PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/423dfd0f3df6f6d9da507516833d8a03/68212183133.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/89353775444.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/fe9a0e3415757126d62bc88955867c08/welixaxuxoxara.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/kajawabagulopusurikugab.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/f41htp6g7jsqlcjrll41ea2861/nadajozinowodapazu.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607822ef659b5---9579010981.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/98476949028.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2ac7c39c89---46454271824.pdfIn PDF document text
    • http://herculesestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/51254529066.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/13308418056.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/08cdd7e04d9f937c739e840106442a6b/pupunazav.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/ftns7vdcoboemh3vg8nvvum1um/kulafej.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/ledofiw.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/1e7adefc2335987cb6067614892c97d8/45935548926.pdfIn PDF document text
    • https://cdmsig2.com/ckfinder/userfiles/files/48426706888.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/5ac375f30ce606cfbe17aea7061042ed/95841608871.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/10728039423.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/vukal.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16085fb05e26b7---sekixukixutalexafule.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/suzukolumawubu.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/19117612250.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=letter+to+cheating+exPDF link annotation
    • 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_off00011c29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C29 10356 bytes
SHA-256: 31a266cddb7186c76b33d3dc0db4e33571fd65f693e8c33ed334faea9d2f49f2
font_01_sfnt_off00013382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13382 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014b94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B94 17408 bytes
SHA-256: b712c44bd92e8fa14cdd06dc424c42ae2d51869d888d53820ea5e746eb959a24

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