Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c8c44b4bec5eea1…

MALICIOUS

PDF

69.5 KB Created: 2021-06-11 10:25:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 9e662e0346c7bdaf132bbe5d073b85a8 SHA-1: f11398eebf87300491fda46576bc124e38544348 SHA-256: 5c8c44b4bec5eea1d5838b511720f25c0342c0dafbe5d94e0da93a91883a8c20
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm used for phishing or malware distribution. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://synerhu.ru/uplcv?utm_term=aslam+kassimali+structural+analysis+4th+edition PDF link annotation
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/aad47c68f104967009a1e0629b100e41/37731414060.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/bulojegisosotik.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/11879844426.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/belobexa.pdfIn PDF document text
    • http://fitviewer.biz/files/file/58130256338.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/1c9407cf3598864a9fb831fc1d11908a/jidezerale.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9877f5b207---gefazosexowifivo.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803040d9037---bagamobunovoviranovoxiti.pdfIn PDF document text
    • http://kubabus.cz/novy-web/upload/file/74451229345.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/67228971767.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/88643887736.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a1cd85dcd7992ada771ed320e2107d03/kekatunoridagezunexed.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/2c113c20aee140658ef8c430396434d8/ritimefikuke.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160b32b2fe8ed2---88657074799.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160838c5e998bb---nopabamivub.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b783580d8---75650978215.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/hqaooa72cam298l93ebcfncj6h/poluloginef.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/90407503256.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/df8a1cd00717bd823a8cf7846c8e80bc/39135378359.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F2 5420 bytes
SHA-256: 35b7d67f8845684d072fce3bb79fbfc467b9019cf9dee5c49eb079fe00b06339
font_01_sfnt_off0000e73f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73F 9768 bytes
SHA-256: f72b738c9d6487c1d2f4b0f5b0a6f9cd016a55fb24a82965776efd7d706dd081