Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf2ec2440485d81c…

MALICIOUS

PDF

87.9 KB Created: 2021-07-03 01:46:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e9ce79b3592dd46e4868982494675b0e SHA-1: 0411e7f4faff3fdd5afa841b6117fcb624ac7750 SHA-256: bf2ec2440485d81c88c2d1541b34458a23b43649f949fc8321f4be4ff06be097
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://laborke.ru/uplcv?utm_term=different+types+of+archeology
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/f52ffb69fbd0759fd34c24640a313590/loledemeweniwada.pdf
    • http://chinamakina.com/userfiles/file/raremidesojapen.pdf
    • http://flatadministration.com/uploades/fckeditorfile/99850486984.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16072016c81cf9---82823260594.pdf
    • http://ehoron21.mn/uploads/files/dodipidesorarolu.pdf
    • http://booklandbooks.com/userfiles/file/fisuzoten.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/8faa4c8ef5807cda4ae3ee9c21a8b1e4/5079830918.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160b072fb6ccf5---91001585128.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d98506ac9f---2248116367.pdf
    • http://alexlunacoach.com/img/editor/file/5657581820.pdf
    • https://zzarosiscarampola.it/file/wapugukadokoturi.pdf
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd30519dcff---tepovonobusupulu.pdf
    • https://www.stjohnhomelessshelter.org/wp-content/plugins/super-forms/uploads/php/files/194607d80e8d1255162ae0d5397588d9/nojevovunuliki.pdf
    • https://condominiovillage.com/userfiles/file/7110820107.pdf
    • http://poultech.net/d/files/52222754398.pdf
    • http://benthanhsgfarm.com/images/uploads/files/wevotorewixizojeta.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/1c5ja6adu9jvk473t65tpgnsr8/53093032056.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0e68d1853---lexusivupuzuf.pdf
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/009d0fd02e433ba6b902765afb99b90b/dosekafurofod.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/e9v9ec16qu2gnjtoojlhlr539o/dogizaxokolorabejumej.pdf
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/aa5cc8c7ca74cd33f3fed0661101f340/rifabuzakaro.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/9miqtgd9hinh72jv5h3gimhvhl/99393214010.pdf
    • http://matstravel.ru/userfiles/file/15414765630.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/bbd345ba4b341395be72c1f1aae86aac/29303253721.pdf
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16077e176dc20e---tuvuniderirogifef.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_off0000f30b.bin
3f9e6abb57463e5339766ebda6ec775b58b5032dddb1f97de6011252e8a58d10
pdf-font-stream PDF embedded font (sfnt) at offset 0xF30B 10876 bytes
font_01_sfnt_off00010c27.bin
53ed311bb8803fc58fdb446bcb283bf9e04c8a9a0bc1067b961a40e4e2ce76a6
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C27 17516 bytes
font_02_sfnt_off00013a23.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A23 16792 bytes