Malicious PDF — malware analysis report

Static analysis result for SHA-256 044fc188e5bfec7f…

MALICIOUS

PDF

78.7 KB Created: 2021-09-05 01:14:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 356e1f7ff8895ad4e84db2f6ec9ab86c SHA-1: 387a52875cdd80509834e89b2b05f3fa457ee827 SHA-256: 044fc188e5bfec7faa4603cd10cd83742363ec7d0163d4b788b1a619634f2c77
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan distribution attempt. The document contains numerous links pointing to potentially compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to exploit vulnerabilities or lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://dok-vo.ru/userfiles/file/webimimogerata.pdf In PDF document text
    • http://avtokapriz42.ru/userfiles/file/mapabajufipunenatibo.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/290893uhqfd2ube2vgvpjddsj1/5717705442.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/82fc1ee50e3dad424a82d387768b321b/silovapanazosegup.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210716015624.pdfIn PDF document text
    • http://irpuyesh.com/cache/fck_files/file/35028669363.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ebfd28e9c---gasuduz.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/n0qcu5riljkjkr6m7ummtuoda1/leloze.pdfIn PDF document text
    • https://associazionemusicaviva.it/uploads/file/tatalagox.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608000a8a060c---93207854698.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/583e397097621ca61d8127983bbb2967/23321861093.pdfIn PDF document text
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/32633898400.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086cfb6506fa---widapot.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/36784353889.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/muwevateferopevuxobofuxez.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/kamasuzuxiraxelan.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210815064948.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/57573702182.pdfIn PDF document text
    • http://exdebt.bg/userfiles/file/gikozegidi.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608edaf7814fb---pagilifamagube.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/ramemurowimi.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/131554421172.pdfIn PDF document text
    • http://spiregene.com/image/files/20210701_122531.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/36808108186.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=logo+book+pdf+downloadPDF 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_off0000d136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD136 17600 bytes
SHA-256: 56d84e4d5efbf277d3f5d6857b6b2ec8c426de144ba66a25912aceded54b51e2
font_01_sfnt_off0000fe53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE53 10360 bytes
SHA-256: fe2e3a8d1ee6673d56868242cee6e2ed5a5b68753da655564b12bbdfc1fd4c3a
font_02_sfnt_off00011576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11576 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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