Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b8e4816dfd55108…

MALICIOUS

PDF

77.1 KB Created: 2021-09-12 10:24:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5644130f018b25a674863d0f2e7bf432 SHA-1: 08f09a792a2a4fbd3f883545b48225901a0532da SHA-256: 8b8e4816dfd551083aa9028559736e2d75d378ea40dac0eab415f37e26669a3e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and links to compromised WordPress upload storage, indicating a link farm designed to redirect users to potentially harmful content. The presence of embedded URLs and the nature of the heuristics suggest an attempt to exploit users through deceptive links, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://coretry.ru/uplcv?utm_term=gta+3+cheater+apk PDF link annotation
    • http://demenagements-remond.fr/userfiles/file/20210911235247.pdfIn PDF document text
    • http://etnorom.hu/pictures/rumuwuvudizijebagositopal.pdfIn PDF document text
    • http://sualpturizm.com/userfiles/file/29498234168.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/c9fed2bc8739aaa29f3eccd81505b119/51346279609.pdfIn PDF document text
    • http://aa-nusd.jp/60822823465.pdfIn PDF document text
    • https://semot.com/Store/userfiles/file/jasitozelumetazovu.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/32096045894.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/19938991900.pdfIn PDF document text
    • https://doan295doson.vn/namthuan/images/news/files/72619283046.pdfIn PDF document text
    • http://kemnhapkhau.com/upload/files/95578385560.pdfIn PDF document text
    • https://transturist.ba/ckeditor/ckfinder/files/files/12417335109.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/lomowotabirerudijili.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/wopixepavuguruzenofa.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613d247843f56---64578657224.pdfIn PDF document text
    • https://lifesmart.ro/ckfinder/userfiles/files/87046619539.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/33919955997.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/pepumoniwowotefanosuwode.pdfIn PDF document text
    • https://nexusmediation.nl/files/dozutitel.pdfIn PDF document text
    • https://rsebolivia.org/userfiles/file/86781406513.pdfIn PDF document text
    • http://xinchenfast.com/upload/file/29825352363.pdfIn PDF document text
    • http://nomayaku.com/userfiles/file/70539640965.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/7d8544b68c98079b626b778038e349bf/54626767285.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/f3ee5100fd76ed2d7b97775be721b25e/xafapikasuk.pdfIn PDF document text
    • http://studioaeditecne.it/userfiles/file/posepomodekeketatu.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_off0000cad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD5 10244 bytes
SHA-256: 7bcf866fb9a15227ac7e2b48490aa08efaeddcda42355ab1744d0a2c81cce979
font_01_sfnt_off0000e212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE212 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA24 17192 bytes
SHA-256: 5c9c493b003d8ffab2d6acd126df9c197c050f22f91c0a9c124629560bf383e5

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