Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd4b0faea9dce31d…

MALICIOUS

PDF

67.8 KB Created: 2021-09-19 03:11:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 914a8210dcb15613bad37b9bf3f11123 SHA-1: 3b815d0352654297082dbd3cf9faaee94cb23dbc SHA-256: bd4b0faea9dce31dfab933e4d7aed862e4ded36c8451273600828e318f27b8ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised or disposable hosting, forming a link farm. The primary purpose appears to be redirecting users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://inunekocp.jp/mailmagazine/upload/files/pezizunudupomuromineka.pdf In PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/komifoxeripi.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/piwudedemosegudem.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/balasenozinon.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/mepebagod.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/c41bkhr4ga0b47feusptuct96r/26539808350.pdfIn PDF document text
    • http://sinoorchids.com/image/file/burusef.pdfIn PDF document text
    • https://investincarpathians.eu/app/webroot/media/files/17242612876.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/88748780625.pdfIn PDF document text
    • http://garderoba.sk/images/_file/82409922454.pdfIn PDF document text
    • https://anup.bo/images/files/nokafivaritaziniforakaj.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/50169735002.pdfIn PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/33860458025.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/18795721223.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210919063302.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/75e6a9a163912b1fbb838b286d623174/funametupeli.pdfIn PDF document text
    • https://penal-garazh.ru/files/89402262991.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/b0e9fecd7755712c7bb9128ad878b7c5/bodezedebilavisebexufoji.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/cc9e4ec7c337e0553eb6d3ac7e5e0109/sesupemewuve.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/53611655744.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/perake.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/23735276140.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=vigero+gta+5PDF 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_off0000af6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF6A 14364 bytes
SHA-256: 155bf4a5451574d08dd0c7e6576c08368e311b76d3ebc32bccc69c67ac75cbe6
font_01_sfnt_off0000d382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD382 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB99 10068 bytes
SHA-256: 8b81a3460aab7c1f04124df3d4dcd1dff3f46e67d71cb71dc85312a442ba3219