Malicious PDF — malware analysis report

Static analysis result for SHA-256 50b1b7332bc0eb27…

MALICIOUS

PDF

84.7 KB Created: 2021-07-02 18:42:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8987df31bafe84af50aa6f5dfc65068d SHA-1: 68693a068ebffc73ae84f7eb53194987716312c3 SHA-256: 50b1b7332bc0eb270da44005770d0b57a6444381cb845fad786e5f5f7b86272a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV detection indicating phishing and trojan activity. The document contains a link farm with numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the presence of embedded URLs and the overall structure strongly indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://ketchas.ru/uplcv?utm_term=benue+state+history PDF link annotation
    • http://stroisvias.ru/userfiles/file/82975543371.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160862f961bd55---kopuxolubega.pdfIn PDF document text
    • http://rchs1964.com/clients/5/58/580abc73d3aac4ea3a2bdd7c75327783/File/mumuniduzil.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/8ail2479ivvrfoqm12u2spr32l/31012709272.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c89527df6e---2128300492.pdfIn PDF document text
    • http://christopherdallo.com/file/72081168920.pdfIn PDF document text
    • http://modern-pro.ru/files/file/81670506311.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4835eb899---girusazisomonet.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/xofere.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/75690080540.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/vekezefilumepuvunofu.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/ba915661970bbc57fd54d39ee1aef416/32521324161.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b007126e83f---28977489216.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7dd496e9a---28309602525.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec4c114d97---45081699321.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/31091572289.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb20740e37---rigozaxoxozez.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/3607333612.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/lojidodazagajotosepamafe.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/juwajisilapavuwasikifowux.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160916de975171---fexawi.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c284999fc7b---vasoxofune.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/kudepeka.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/92410354174.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/93d8079a6ada8ebdc6b5ad6282ce7796/22897702213.pdfIn PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/navebekunoxijuluwitezup.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB5 16260 bytes
SHA-256: 740cdfdb6f1af45299dd41f5e0a26066506641e2d837d672ba9febd052b13363
font_01_sfnt_off000115d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D0 10428 bytes
SHA-256: 91ab2122c471f5f478f502b69c1f5bcce9ed808894579af79540216acbe841af
font_02_sfnt_off00012d7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1