Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fc7fcd37b1edf60…

MALICIOUS

PDF

89.9 KB Created: 2021-07-08 06:45:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 5830290b32df006c8dc7d558b41b98a5 SHA-1: 52bc54476398a4dc8b843b4362eb06130877010d SHA-256: 8fc7fcd37b1edf605f1a912ea7f31bbeee8790e6572f7dc88159612ab04b1d32
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious sites. The presence of 'cmd' in a URL parameter and the heuristic 'SE_LOLBIN_RUN_COMMAND' indicate potential command execution attempts, possibly to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://alshamiltrading.com/alshamilfiles/file/84978422011.pdf In PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16078ed0fb65f6---jesogane.pdfIn macro / runtime command snippet
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/7vqidos4qjnodqf9pms093tb01/13815782110.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/15134407818.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/69d25a4043ca482ab9b3144c9cd8f2a9/gulonosod.pdfIn PDF document text
    • http://alexhoffordphotography.com/temp/files/file/4225352476.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/tpf40aflr8k2t1qmp702nuerr2/sebupipamivudoxon.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/53945076735.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/b08a10b128e331984bfdc17643eacb55/83949901690.pdfIn PDF document text
    • http://vienhung.com/webroot/img/files/41414768771.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/29345965985.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/d8788c982998238040dede874e560c47/tusul.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/4e6241c33a9648d305d3e61a239f571e/dukisazivumazalixegademo.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/zifot.pdfIn PDF document text
    • http://tencanpowder.com/d/files/jotodonupij.pdfIn PDF document text
    • https://cncunse.com/d/files/goxegubupovonakik.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/lavufoturipebatu.pdfIn PDF document text
    • http://halaljones.com/uploads/files/91343654298.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/nulidaxuwi.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/9btke9ji4g0cfu956sieaug8m6/7486232475.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0f9fb08ab---mitajuxutorezigube.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/28872832800.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/781b3bdb578458f02e027ef6ec0e659d/lumibadisorupirewinoje.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093c88ed790c---83060757125.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/849784In macro / runtime command snippet
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=win+10+product+key+cmdPDF 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_off0000fd03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD03 17104 bytes
SHA-256: c22d1ae83a3dc1021862c78a0d8a5ab448321f378963e7f0952c31bbd447bc9a
font_01_sfnt_off000129c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000141de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141DE 10772 bytes
SHA-256: c862903d595e88a40bdec23d5e37a98d2b2235bd415d4a469ed0a82ab969b506