Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd8e9eb5c0130d96…

MALICIOUS

PDF

88.3 KB Created: 2021-06-28 05:26:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c036bf743477555b0bb282b4407835e9 SHA-1: abbb68b4d784ff8d3dae9ae3a005dfbd20710aef SHA-256: cd8e9eb5c0130d96984717adc6b3f17b9772132f7866bc8460ffd1630cfc643c
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, suggesting it's part of a link farm designed to distribute malicious content. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The embedded links likely lead to further stages of infection or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://opakowania-loga.pl/zdjecia/fotki/file/vexawinegevi.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8ec5e3a29---kuxepewenegovejarozoves.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/4f44aa4f0eedeb6307490d677bbc5429/88118926956.pdf
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608ced7357442---84377314751.pdf
    • http://budoprojekt.eu/obrazy/file/murebibugojuxe.pdf
    • https://altinhediyeler.com/calisma2/files/uploads/73232026760.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/1e204bu45uvmlfue8ek4n5n246/14382025096.pdf
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/d4c95d0b06c4fd81bd8b3cbc19dc4253/89392866688.pdf
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/3ueqnj2jusri77e5am8drbk0mu/73779999967.pdf
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0afb0b059a---tomodigipanegudasilikevav.pdf
    • http://centreforeffectivecoaching.com/media/file/jojubenozoj.pdf
    • http://zionhillfirstbaptistchurch.com/clients/73368/File/fumavajarakofoduloge.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/6c8d7a30572f7cb00fe72ef5bd5f4e8e/wedupopilobadopovego.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16096040342a51---91240969009.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe1a8d47ca---xulerudonepisef.pdf
    • https://premium-house.uz/images/file/sezagejewoxanotulofimaje.pdf
    • http://archi1919.com/smlclub-files/file/ligapos.pdf
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/ceb2eef575a806b2b413d2e29f43dea1/rikix.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0405f1f15---50626862055.pdf
    • http://studiolorenzoni.eu/userfiles/files/47561199796.pdf
    • https://namdolove.com/FileData/ckfinder/files/20210529_038E9D41FD7954A8.pdf
    • http://hy-concrete.ru/d/files/niponosikezigusije.pdf
    • https://sasalidayanisma.org/uploads/file/jitosodiliwurikuzetexo.pdf
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/ce23fa7d99693e5909329b786ef9f0f7/68143286255.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=the+handmaid%27s+tale+streaming+sub+eng
    • 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_off0000f64e.bin
785fcfb1102dd0a2a80afae40f497f55a54c88d334ef7ae1e34e4cc9c84f1ed0
pdf-font-stream PDF embedded font (sfnt) at offset 0xF64E 17484 bytes
font_01_sfnt_off0001234f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1234F 16792 bytes
font_02_sfnt_off00013b66.bin
f3ff6d26ba9b2493795ad827a0723e919ed0f1b9c4ddfe4b6d380b9f255c021d
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B66 10812 bytes