Malicious PDF — malware analysis report

Static analysis result for SHA-256 34a76c9bb4ae34bc…

MALICIOUS

PDF

84.9 KB Created: 2021-09-04 02:34:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 9c778207afdece8a892782fe16e1739a SHA-1: 2d64f947f882978a311acb57c7bad26a7443e627 SHA-256: 34a76c9bb4ae34bc05dc3f26fa1a845f9fa12ab96f579eb98a663a54a7d4d38e
176 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, indicating an attempt to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. No scripts were extracted, but the structure and URL patterns are consistent with a phishing or malware delivery lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://pataibicaj.hu/userfiles/file/xuxabuxaloberi.pdf In PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/3886f23029069b3381512af5dc33d19b/12977728445.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/529826f638041697a10d9a9f7f896601/musimasonewobukamaliriv.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/60253054997.pdfIn PDF document text
    • https://peilimineko.com/userfiles/file/56291784094.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/7fjq68e19a3vak96s76cpo69vg/tolewutawilamukuvi.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/87217120451.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/161004ffc4c150---13352853573.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a32bdbcbb36---fosijulibumuwofagumiwajik.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/98a13f418b9110972f6feeb256604c3c/migobotivero.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6831b20ef---tuzino.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/3f61fc6c511e7e159d853d6ae3d420f7/79646594903.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16081c503c1c9f---1514955811.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/18040485513.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/23baa5c951113ec1283f08815e0b141f/13307681875.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/vewowotabowawuzudiloruxe.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/zuvokutujufegazilofud.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210817102641770.pdfIn PDF document text
    • http://kiemtoanhaiphong.vn/upload/files/sozaxukedovatikev.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/74341099435.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/ledojejugubebubogad.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/2hr08k4akqqkslh162m71fn6n5/gogewedemutazetipu.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8b5d58376---62850805639.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/966c9f1c7cc9aed05dfc17a4311174ba/83575698530.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=fine+blanking+die+design+pdfPDF 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_off0000e8ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CA 17676 bytes
SHA-256: 64523e3ae094934e0a1d7bfe170e3651afe27ad8b5adb773a2d44b917af90964
font_01_sfnt_off00011674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11674 10564 bytes
SHA-256: 36a5367baa38bafd057ff868fc96e3f8c56127bfefaa1a687656a00716761534
font_02_sfnt_off00012e2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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