Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a814b83d13e172e…

MALICIOUS

PDF

70.0 KB Created: 2021-10-02 19:58:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 6259c089cd3b98c714ade6bd9f3a29d3 SHA-1: c3927d2ab0c80fdf0ab5cb60a545750416a1105c SHA-256: 6a814b83d13e172e8b8f9eb8a8aa81302fd9ffdb7fb7c19d55edb30858b92c87
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many pointing to compromised or disposable domains, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://avandcie-automation.fr/ckfinder/userfiles/files/59506599776.pdf In PDF document text
    • https://dernek.daynexdemo.tk/upload/ckfinder/files/novugupo.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/tifujaxi.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/bf7f95489259991c9b9ff2afa7a60721/46115501058.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/75254896016.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/13410298569.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/kudafuju.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/sifituzekitamedidodijol.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/vexubadozonit.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/fc7472161ffac43c65a188714f0e5b17/70934348449.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/80640629523.pdfIn PDF document text
    • https://h1t-urlaurora1-turbo.com/contents/files/moninodidarobobimugop.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161515e04131b1---beropajusifirufasapu.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/49193153423.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/70245940323.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355b2463684---netoxopeko.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/regadusegafoguse.pdfIn PDF document text
    • http://juditphotography.com/picture/userfiles/file/28512630018.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/12035848318.pdfIn PDF document text
    • https://tgvl.in/uploads/fck/files/74317976205.pdfIn PDF document text
    • http://3m18.com/images/editor/files/88944112503.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/zatazunomifutodasuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=continuous+learning+mindsetPDF link annotation
    • 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_off0000b14b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB14B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c95d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC95D 16072 bytes
SHA-256: 3ffcfa1e83604b69eb9262c343322ac3bb819c47484aee9648179ea2bf932d90
font_02_sfnt_off0000f225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF225 10724 bytes
SHA-256: 07de985edc0df3a8f150195691517ec35df4970d48cc4073e383128a3f6591da