Malicious PDF — malware analysis report

Static analysis result for SHA-256 180a1d81d074e6f1…

MALICIOUS

PDF

71.5 KB Created: 2021-09-07 12:46:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 741c0d5e57e0e5f213567c9bb8eb4278 SHA-1: 32595d6e52ea1f164a050a89ff9fef8babe6101b SHA-256: 180a1d81d074e6f1173269352c55a5c3e29292d69ece4414937634426eaf02cf
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to numerous external websites, many of which are hosted on compromised or disposable domains. The presence of 'utm_term' parameters in some URLs suggests an attempt to track user engagement with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://medvor.ru/uplcv?utm_term=small+arms+ammunition+pdf PDF link annotation
    • http://kondicionery-vidnoe.ru/upload_picture/file/12160421358.pdfIn PDF document text
    • http://tce.vn/imagesflashupload/file/39229416381.pdfIn PDF document text
    • https://used-machinetools.ro/app/webroot/files/userfiles/files/99586548597.pdfIn PDF document text
    • https://elegune.net/files/galeria/files/5150142228.pdfIn PDF document text
    • http://pretaporter-pegah.com/userfiles/file/mosegonu.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/wonekoxadolotiximurokib.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/lovavodotopijitopu.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/7ac480a4b96f604274081be99ecef176/86275979050.pdfIn PDF document text
    • http://ghemassagenhatban.vn/Images_upload/files/36147123108.pdfIn PDF document text
    • http://kokalietudarbnica.lv/files/files/vanefigonanosikuteni.pdfIn PDF document text
    • http://barexkft.hu/userfiles/file/wodinuzofuladig.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/ac0bf6157916c097e3d8d7c82586eeaf/63784103497.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/5rchk7ilt97hjl8kr1vbmq56c1/45702656403.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/47676223759.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719ed4994af---21062482881.pdfIn PDF document text
    • https://bataretak.com/img/files/file/kakovijufivugukadisoxu.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/79172931046.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/gizapedifigomerabuxo.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e8746845b---somujajukiwupolimeret.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/1625bb6049ffb35bec1e44f079928adf/80357503061.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/puteduvatitekenumukaw.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/tfndgfqmuvs0o4qtb8v1602046/lemig.pdfIn PDF document text
    • http://chuaphucluong.com/uploads/image/files/duvofinubaxizobejijig.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_off0000b80e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB80E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD025 10704 bytes
SHA-256: 084adf034f6315214d7182ff0def86e1defb931fdbb615757e628b958ff00659
font_02_sfnt_off0000e89f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89F 15604 bytes
SHA-256: fe0b7b84c8b95425cf79da02ba0a81072499b9099f0a7b405320f02cfc431b62

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