Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a08007742c410bf…

MALICIOUS

PDF

69.8 KB Created: 2021-09-14 08:30:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1e568d62d64e8d25813de7e804960c2d SHA-1: 163ea53df43b4c214e80c1b960830d3e3fd0d878 SHA-256: 5a08007742c410bf9cc93f1ec950d18e1051f1ef2214a9da6f62725d843de4e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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=my+movie+apk+download PDF link annotation
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/a2290925526f828ae7ceb3d6947c30e1/venawusutunivi.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dccd93ee2e---nutilulowidowulajupajami.pdfIn PDF document text
    • http://belovosushi.ru/files/kaxozaxasuxigesirutof.pdfIn PDF document text
    • http://tercovci.cz/files/file/zononugaxat.pdfIn PDF document text
    • http://alcantara.cz/data/file/16568075521.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/baxefalur.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef5fbadbea---13112075122.pdfIn PDF document text
    • https://areicon.com/images/file/tasexuwu.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/m54vp75qtqrvpb0l2c18v6uj9i/82560824387.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/kodowutadawikejasatel.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/gotomixod.pdfIn PDF document text
    • https://www.stock2morrow.com/ckfinder/userfiles/files/54896771118.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013/admin/ckfinder/userfiles/files/68007331542.pdfIn PDF document text
    • https://carlojans.com/cms/file/rofedu.pdfIn PDF document text
    • https://ddtoyz.com/ckfinder/userfiles/files/xonuti.pdfIn PDF document text
    • http://tech-in.info/bramy/userfiles/file/vakiguvapesumezurimupid.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/lic22kbs4u6v50gac0hh4vbeub/12457493298.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/rumuwerusuwibevojafogi.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/ac0e00071787872a3fffa70cdec7bf02/jezenef.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/tofajupidugemov.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/file/77143032250.pdfIn PDF document text
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/67414514403.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/45278282150.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/65315392240.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_off0000b587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB587 10540 bytes
SHA-256: dfd7b8f1c4e4c000f633a43e92ef618bf5cc0546ff0865c25eac8b25072f436f
font_01_sfnt_off0000cd85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE597 14520 bytes
SHA-256: ba9df12b27845bf31cc772f692e09b2245eb2a7c67db58c87baf7426cc2549b8