Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d79a5af54c80db5…

MALICIOUS

PDF

91.0 KB Created: 2021-09-07 15:42:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 66fbe9cf3f244729f350dc17f5dd0eb6 SHA-1: 11a31dc27cc0ec5d35adcfffcf8aba44c7659796 SHA-256: 2d79a5af54c80db5732a03e6115e04c2e5b5d83a4ec8248250bb6b77d0dcf3a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of multiple external URIs and link farms strongly suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://dgjst.com/upfile/file/12312583895.pdf In PDF document text
    • http://miguktour.com/FileData/ckfinder/files/20210829_41CB4AC1BB5998CB.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160791d1823635---nesuwane.pdfIn PDF document text
    • http://chonburi33.com/userfiles/file/lazemokalire.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/24121847496.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/43b142a664d1f5d84d94398fd49ba115/rumaxinexatazotipesufege.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/9499953659.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/c34ee369c6d771ccb9e12e8819c16019/85669096346.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/bf16e1155430dc2b56ec1c7da41778e0/fekiwemajok.pdfIn PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/6nq8tnneh2pn3nq2sucl6ufoih/74904360711.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/fevifebiz.pdfIn PDF document text
    • http://zigzagontwerp.nl/sites/default/files/file/sisigosalovule.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/1645479320.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/rexakagelamigegezebuvame.pdfIn PDF document text
    • http://mamitobe.ru/files/file/38685127173.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/27639216519.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607c76309ab2a---96260428675.pdfIn PDF document text
    • https://exlite.it/ckfinder/userfiles/files/godolanefujikope.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609078b1dc6cf---11038652987.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/wavoluwafigafisetife.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/revabupasuzepowovadugo.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/pabojuboxi.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/sonaj.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/gulotanibegavojesexo.pdfIn PDF document text
    • https://armenia4d.com/contents//files/wepojebadalukotagonu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=decrease+file+size+of+pdf+documentPDF 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_off0000f9ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000111ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111FF 19592 bytes
SHA-256: 44cb6ba41ed91b1b1bc891b329e5815fccda4bdc42238ee7f9364f91d7b65502
font_02_sfnt_off000144dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144DC 10940 bytes
SHA-256: cd9050a06d8f6f91401e89c27ddce2073aec6c42a1d570103759631c901e1aba