Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f1c9013599f35f2…

MALICIOUS

PDF

75.5 KB Created: 2021-09-16 03:21:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4f9c3d6c6e9756036e77943647c7bb14 SHA-1: d0e8e28a15db84eee253f1749231a9d1fdd7c334 SHA-256: 5f1c9013599f35f2a46c2e5377e1ce32a6fb97dbfeafd96f91bc14225c75c5c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress upload storage or disposable hosting, forming a link farm. The presence of these links suggests an attempt to direct users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://pistant.ru/uplcv?utm_term=there+will+come+soft+rains+comic PDF link annotation
    • https://sausalito.com/wysiwygfiles/file/13979376796.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/rifikokuriloviluti.pdfIn PDF document text
    • http://drsrkbedcollege.com/ckeditor/ckfinder/userfiles/files/nadasosoxapixuren.pdfIn PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/59825203154.pdfIn PDF document text
    • https://equalitas.es/userfiles/file/napirulig.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/jusefulov.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/161405ec6a3488---mazavewavar.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/2258694963.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/judemubewokuk.pdfIn PDF document text
    • http://irodaszer.lukinserv.hu/file/5243695475.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210914_141510.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161417e2cce3a9---95431116116.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/21841571599.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161380afbf413c---moboberut.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/vazelekakiwibaliriluvolo.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614118a306288---79985427746.pdfIn PDF document text
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/26539517798.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/g9aa2p2c7ubs39huiuf7rk1gj3/sivururevozaf.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/66630336934.pdfIn PDF document text
    • http://ieltsadd.ir/cache/fck_files/file/bupaxoniruxedokeniva.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/pabesugamaxurijebosufa.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/7676966034.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_off0000c0ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0EA 18052 bytes
SHA-256: cad5a0f9c271b8525d3eba5a6301a9746b48c49429c1f31fb00f143ccf852ce6
font_01_sfnt_off0000efd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD6 10648 bytes
SHA-256: f041483d5dd25c7924c8c342d6a310cbd1b1e1c5da6e9348ff9dbf9d85dcf8a6
font_02_sfnt_off00010826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10826 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1