Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ae2a97cf09ff475…

MALICIOUS

PDF

80.8 KB Created: 2021-09-21 12:52:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b4cfadd70d0a40a1e1e6e40a5b3154b9 SHA-1: e397e1831d60f29d075f0743f4304b013f8fe0b3 SHA-256: 3ae2a97cf09ff4754c8942467df20204e62ab0b05af096d152d91bd479e4f6f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://crewmak.ru/uplcv?utm_term=disorder+in+the+american+courts+pdf+free+download
    • http://trongtinpc.com/luutru/files/tatedisudateseditamozudow.pdf
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/47879412881.pdf
    • http://olivetheater.com/userData/board/file/2601398150.pdf
    • http://artin-intranet.com/ckupload/files/diletegamufo.pdf
    • http://z-sinpro.com/upload/files/61405623578.pdf
    • http://miet-boot.ch/images/uploadedimages/file/41175386072.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/3qmdom5ji1lt8ia1ie3g6ndus6/bajutofaluba.pdf
    • http://hybsch.it/upload/file/vunufilamiriweguxanax.pdf
    • http://baloneacessorios.com/_upload/file///38071503366.pdf
    • http://intimatehotelpattaya.com/image/upload/File/78524644961.pdf
    • http://kondicionery-himki.ru/upload_picture/file/jadokikesaga.pdf
    • https://angkaganjil.com/contents/files/50054649353.pdf
    • http://adhdesign.de/userContent/files/20210903155252-81763890510.pdf
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/28095491322.pdf
    • https://ddtoyz.com/ckfinder/userfiles/files/80844406185.pdf
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/8614795323.pdf
    • https://andana.us/files/files/83819489371.pdf
    • http://kxzyjy.com/CKEdit/upload/files/91542469211.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16143293d06302---dedikitutigorirafak.pdf
    • http://cancercareresearch.com/userfiles/file/38611764683.pdf
    • http://taiwan-tsai.com/upload/files/dugexemutoximojuk.pdf
    • http://baove247.org/upload/files/6058602394.pdf
    • https://portalbime.com/UploadedFiles/New/file/puvefodijubinupobebi.pdf
    • http://lafiestadelmoto.cz/files/file/zebunexoru.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/aa6d69a35ca63f78879663dfbcaa9c81/xajopigusimapomoded.pdf
    • https://www.posluh.hr/ckfinder/userfiles/files/11600507830.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6e8.bin
d585adc24730b0d696c64d1ff7ef26e316b60143449e946370998f045a800b32
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E8 17288 bytes
font_01_sfnt_off00010359.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10359 16792 bytes
font_02_sfnt_off00011b70.bin
c51cd757eb710801c8532985122f1d1f1a36870550e44246096d9dee07e88286
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B70 11072 bytes