Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9882674bab29a55…

MALICIOUS

PDF

78.7 KB Created: 2021-07-14 04:08:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 05684c9bd62d88bbd4f7af2966977cdf SHA-1: b40dd79650d1daa273d997376c4a1415c7f355fc SHA-256: d9882674bab29a55ef7d0147d52cf5d4a016b2de0e0af0ead3a61dddd7219792
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, indicating it functions as a link farm to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The file's structure and URL patterns are consistent with a phishing lure designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a17ef0fde2---jiwesulufupunagofaf.pdf
    • http://novussiteyonetimi.com/uploads/file/43415365253.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16079ed482002b---12373035587.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/7g9nt638me13hc816dlrdjg1r7/60266827469.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b40c8bd7331---tajanejalularawoxaf.pdf
    • https://beaszemin.com/files/4068142355.pdf
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a12060a04---watunubojuxomojasilobu.pdf
    • http://topoint.cc/userfiles/fckFile/20210705232920.pdf
    • https://actorconseil.com/files/file/jubaxajuzebavexatizokubu.pdf
    • http://mdsalon.ru/img/lib/file/2697815518.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/nc7j5oqorqj8v1tcg2k5volvb7/71866469254.pdf
    • http://lightningriskassessment.com/ci/userfiles/files/lumabajiboxoso.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707b689f16e---16141875091.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077c246d003f---36211993579.pdf
    • http://alnadaoil.com/userfiles/file/30634453608.pdf
    • http://sibinetweek.ru/userfiles/file/67496840643.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/01f3f0ea020cc5fb9b26ae861c1a6fbf/61432167571.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/93qobe1csg9aklsgfk7dnmj7ff/83743043939.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/459a5d222c9b01a42c99059df4113597/zowuxenes.pdf
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/373f7c7b888fce398d1db86988b0c6b9/13632149301.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9b3e58d11---ranafapinuzepoko.pdf
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/0884469ac07498975b314c50f693f305/vojopirosuwujemap.pdf
    • https://bjjewels.net/nbloom/fckuploads/file/jexasumidujuwobugo.pdf
    • http://detskaoptika.cz/ckfinder/userfiles/files/8271340636.pdf
    • http://hydrem.ru/images/file/gejub.pdf
    • http://merrygoldholidays.com/ckfinder/userfiles/files/70803242627.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=cheer+flyer+quotes
    • 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_off0000d31a.bin
553faba1bf8cc5838764e374a70408bc4861a7b28b77ebed8885648b19ac9b0b
pdf-font-stream PDF embedded font (sfnt) at offset 0xD31A 10344 bytes
font_01_sfnt_off0000eab4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB4 16792 bytes
font_02_sfnt_off000102c6.bin
af810f3009c8b83e3425e041997a085cc7400401db5521d9fc6f1ecade62fe14
pdf-font-stream PDF embedded font (sfnt) at offset 0x102C6 16632 bytes