Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1ba96ba95c27827…

MALICIOUS

PDF

92.5 KB Created: 2021-07-04 21:00:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6d85a1159520c5d0907d946031bcd3f7 SHA-1: c47cded495cb817b3c7cecf2d9220e02ac85749c SHA-256: b1ba96ba95c27827366e73a2c794a7e4698c1e487f61d2fc42f5f96c15701595
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b45d40942d---18228575020.pdf
    • http://waltripclassof74.com/clients/8/87/875eff38522a6836d9fda94c5a2b6b26/File/wekikegudavigawawudabin.pdf
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c89c493a02---88658770256.pdf
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/64829354385.pdf
    • http://studiomarcheluzzo.it/userfiles/files/10112417103.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a07e022b7a---89279495708.pdf
    • https://rowadalbyt.com/userfiles/files/63572263911.pdf
    • https://sp-pir.ru/wp-content/plugins/super-forms/uploads/php/files/2dd9653758c20466f8a86e79297138d0/54714841266.pdf
    • http://bartuceviri.com/userfiles/file/pikidozixa.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16098681b2cd0b---pumemumejegivin.pdf
    • http://change4best.ru/upload/file/5937435527.pdf
    • http://sooclose.eu/upload/File/zukevebutapepalekuk.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0021945988---zazukiwasevaroxakexosekiv.pdf
    • https://alshaabcoop.com/userfiles/file/67970862011.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a11608ebdf1---xudisulado.pdf
    • http://boissee.fr/userfiles/file/29068444417.pdf
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/3341d6f2defe8018ef34aabe2c356ca7/68578512616.pdf
    • https://cooperspick.com/files/xejakowilepekivuzowajed.pdf
    • http://ofitecnic.es/files.ofitecnic/fck_up/file/relanuvoxowodujamopi.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160b79e6ca1aad---kaliw.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f72edafa77---28849515285.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf8c1da936---29660115781.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=short+skits+with+dialogues
    • 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_off000104ad.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x104AD 16792 bytes
font_01_sfnt_off00011cbf.bin
3e28d364ca11d75cdd8304eb30ed2b14014c77483be8eaf6bf1851f75895492b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CBF 17720 bytes
font_02_sfnt_off00014acc.bin
d943552a41e512ef733b9dad9d99f0566e2d1b0dc48f1bb7c234245162f40649
pdf-font-stream PDF embedded font (sfnt) at offset 0x14ACC 10776 bytes