Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c2528d5bf210bb3…

MALICIOUS

PDF

79.2 KB Created: 2021-06-28 11:56:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8804640e015d5581c956a858e3cae05a SHA-1: d42a805d33c28ed65d7b8464aca8333b1f6ba6cf SHA-256: 8c2528d5bf210bb319d70f1255fa1a5d6f7ea754c454b8db1b919ef75bf84d64
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a phishing or malicious link farm, as indicated by multiple heuristics flagging it as a link farm pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the embedded URLs are designed to lure users to external sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://medvor.ru/uplcv?utm_term=neet+chemistry+mcq+with+answers
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/a647c09071ec4b681e3598636c13c0e8/2248423179.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/n7vl2d8s9dv97qdram5g3hm92u/60416319050.pdf
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/855fa75907fd3a542fa7e759418863a0/37294632311.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608fdbb479465---pigipirilifewefu.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607947d19ec81---13852860302.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/2df25d332de253e51f9cdb6a205595bb/vuduxikegopoko.pdf
    • http://atek-ent.com/upload/file/tabawakotese.pdf
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/4e217f5c9b921a64a99885c6b78bd25f/virajazomaboles.pdf
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/610bdd93ddd36d983b2a11592ccc16f7/rimofixorugofonejo.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/5805e51e139253ab15e9cfafa42d7bfe/pororajoxabepibox.pdf
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/b8f740721712b13ff6a4b9890f169917/53683836059.pdf
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775cb0c6daf---79091875708.pdf
    • http://meandnetworking.com/ckfinder/userfiles/files/23746471988.pdf
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/s490gbm54q88fpi7mpj1mo5fj2/vakuzu.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/2fdd845029179ca3bbcbcd6086f733a3/xefumuregiwedogubefajaki.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16081d271b794f---wifidiguloxofozawazuf.pdf
    • http://tauzetaques.com/clients/1/1b/1b95303171b4519794d6fee637ef680e/File/nimataror.pdf
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/91tg86fqnldoatfr0u9fmr0agf/67885251991.pdf
    • http://chupanhnoithat.vn/upload/files/dufatuxovotatovawezujivef.pdf
    • http://www.anieliasfx.com/uploads/textareas/file/70691528720.pdf
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/2c3cf2683df7decc1f271302b28cdb96/97512273921.pdf
    • https://ntct-dz.com/ckfinder/userfiles/files/xifuralo.pdf
    • http://christschoolblr.in/userfiles/file/puledomak.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_off0000cd78.bin
b9964bb3d817129dd352cf901a546ea662d187f76594a0bced693c95233f316a
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD78 10652 bytes
font_01_sfnt_off0000e5c5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C5 16792 bytes
font_02_sfnt_off0000fdd7.bin
e2cde8286001ee754e8fe67eaf669cf494cdbf69c46ae57ad9d743a14f259104
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD7 18192 bytes