Malicious PDF — malware analysis report

Static analysis result for SHA-256 907f81c13377586b…

MALICIOUS

PDF

80.8 KB Created: 2021-09-19 18:57:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 239f6c6733f6525efbb986e32f3b4736 SHA-1: f2cdeafa28235e356cbc9571275aefed54554b11 SHA-256: 907f81c13377586b232670c7acb1fbcded41d286838b9f58be6e67ed57e5597d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan distribution vehicle. It functions as a link farm, directing users to numerous external websites, many of which are hosted on compromised or disposable domains. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a deliberate attempt to obscure the final malicious destination, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://crewmak.ru/uplcv?utm_term=samsung+kies+windows+xp+32+bit PDF link annotation
    • https://centrumschoolka.pl/photos/file/raxofositaj.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/e44b16676c3816f02a2a590aa0b84032/12701135942.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/l448pf8n61fkrqp10i8l19tq95/zumuzazulinujali.pdfIn PDF document text
    • https://lomasdelaweb.com/userfiles/2008.09/file/31894244175.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614118835b110---komapetilijegiki.pdfIn PDF document text
    • https://conviviodihera.it/dati/upload/file/feduzizibenexexujoza.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/91974965304.pdfIn PDF document text
    • http://tayles.com/uploaded/rajige.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/tiluwobo.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16140c18cea450---gaxofolexusin.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/90567411633.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16137e963d654f---zuneku.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132feddca2aa---50987483997.pdfIn PDF document text
    • http://machin.kr/userData/board/file/75437008548.pdfIn PDF document text
    • http://kapfenberger-schuetzenverein.at/userfiles/file/1469519198.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/57056659275.pdfIn PDF document text
    • http://irollee.com/userfiles/file/xavuvujofep.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/32147813571.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/20219111650492398.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210914_DC9AA496B209698E.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/4763233272.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/vobogiwepogikuwixugubibej.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_off0000cee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FB 19884 bytes
SHA-256: 06ff1e40025fb2249361fb2f2a21ad5cddd61448ca6a3404a5f61dc53ad7a75b
font_02_sfnt_off00011b60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B60 11476 bytes
SHA-256: 6899498b1f5141fe2b783a7dfec93766102295811c5791199156b358cc736bca

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