Malicious PDF — malware analysis report

Static analysis result for SHA-256 343635112f52ce6f…

MALICIOUS

PDF

95.0 KB Created: 2021-06-28 03:01:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 6a316cd07d01c4d7f41957bb3d20514d SHA-1: 38bfe2bf69c49a602fa2f9fa7aeb173c8a86c977 SHA-256: 343635112f52ce6f26a8010b03f86536aa1a443976df7aabf38064e504eaf033
96 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting domains, indicating a phishing or redirection attempt. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. No scripts were extracted, and the document body was unreadable, so the primary attack vector appears to be the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/paxefetatud.pdf In PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160862ec32b120---tujifikivemovada.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c943c3e460b---namix.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/5a5533c4d299216adf027ade0a499336/naruv.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/08d96adeb4dcb64a6b566c69ee7dea2f/xatigepizamoroxa.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7efb10653---xowewegojedoz.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6e4f60d15---gujigop.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c96aab64ac0---fefubajuvivojito.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/vonapisifu.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/dudivekejixuremikivez.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/4696765539.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/dni4vinjoqcdjpn6dd6ncd52m2/62081654299.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/ab4c5036463a7aa2305d47aa2986bee6/poputuzugo.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/41b0f05e1e600c019ef5c2d34a6e3dd8/ruvozaxoves.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/ragaw.pdfIn PDF document text
    • http://stylekd.ru/files/vufamavamulawu.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089156fbeba1---gorepiwi.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/d58gupvd0btd53vdfspktaa5n4/94046823314.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160974afec10f3---vuvadabexifobonip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=automatic+street+light+control+using+ldr+project+report+pdfPDF 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_off00011171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11171 16544 bytes
SHA-256: 8fa8a88bfd70af2e3ce2c681b541e04b453cd0f0db0cd2d71fa2eee65615cc45
font_01_sfnt_off00013c3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15455 11276 bytes
SHA-256: 314703680b00455c1cb6bbb6a7702718106551ce2393fabfc78637ea55ce21bf