Malicious PDF — malware analysis report

Static analysis result for SHA-256 da5f8a10508c2c25…

MALICIOUS

PDF

92.9 KB Created: 2021-09-03 08:45:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a99d474ed2bddae77e69fd50695cb082 SHA-1: 753ecc354c4e0b2d0eb77ad1ea8b23f56bb90266 SHA-256: da5f8a10508c2c25d22609be2e0d500818cc035d6c1398c665ad6bfe1cf5b1d8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely to host or redirect to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests these links are designed for SEO manipulation or to obscure the final destination, a common tactic in phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a014f33e739---27423058664.pdf In PDF document text
    • http://kopdesign.nl/userfiles/file/41543328649.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16096e65c69b6f---2625066109.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/89104640760.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16115120318d68---kupijeze.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/6be59c981745c6e5eec41558a6dde3ff/gomeloxefefemizifumog.pdfIn PDF document text
    • http://samsung-service-center.ru/uploads/files/23255932834.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/71752824809.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/vaxowedivifaxitomatopula.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/3b463991baff8cb4148623c2df72c008/25458952367.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/vdt3cr2jqsm4c2kp5h1rec0b7c/73583059657.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/18269726840.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/2f7dfec2b94e57a73f3d505b1112dc92/66742554992.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/f1dafc5666548c0e775cb72cb048e16b/toxomub.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/291e67df67ea92dbac83fcd6b94b66a3/rafumib.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b1fb3d7f114---tadanikerixusapinajef.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/12104214699.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/saxitep.pdfIn PDF document text
    • https://davaocarrental.com/images/file/21197450663.pdfIn PDF document text
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/b7373f7ad15ad3a61e29b084fba4b088/lurasopava.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/murakilanijizadepolusex.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/110b729636120cb015f823bd5c6ee25c/lopaburokijojasol.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/85267774544.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=billion+dollar+whale+book+pdf+downloadPDF 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_off000104f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011d08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D08 10700 bytes
SHA-256: 5062d3c4583fe48a3800eb737097a12f26c68c6b3b8253288f389291308c82a5
font_02_sfnt_off00013543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13543 18704 bytes
SHA-256: a68f60436aed1b84bb85ca65100ff94a56126eaa3d5a1e473f9bbe0f96ef7f1a

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