Malicious PDF — malware analysis report

Static analysis result for SHA-256 af2ba6f0633456ed…

MALICIOUS

PDF

73.0 KB Created: 2021-09-24 09:06:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8d63e2d1b33a4da372b8bbbee54f3125 SHA-1: 01de15612112ca20d62ad2c527a67dfdc7fdc212 SHA-256: af2ba6f0633456edc76e529a04d03fff4141f37368eac3ebb95c31e8fff83377
156 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 pointing to compromised websites, many of which are hosted on disposable domains or utilize WordPress upload vulnerabilities. The primary purpose appears to be directing users to malicious sites, likely for phishing or further malware delivery, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://smidgel.ru/uplcv?utm_term=conditional+2+and+3+exercises+pdf PDF link annotation
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614338e4b21e0---xubebopunexuwu.pdfIn PDF document text
    • https://libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/84766565897.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/fae88b43f1c77a0dd702d0364d49d4d3/36212663224.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/ferorol.pdfIn PDF document text
    • http://simonide.org/userfiles/file/19444004865.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1612fef49af02c---dodev.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/detitefanumaxupase.pdfIn PDF document text
    • http://all-paca.com/ckeditor/ckfinder/core/connector/php/uploads/files/nukaxuxifudenopewafo.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebc7e00337---tuvufoxomotav.pdfIn PDF document text
    • https://fluffy-chins.com/images/file/fadukukixogidifobip.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/porokopividusaz.pdfIn PDF document text
    • http://eros-arena.com/eros/userfiles/file/xubowomufovugofivi.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/51280352593.pdfIn PDF document text
    • http://ustunongel.com/image/files/99490670476.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/57564385168.pdfIn PDF document text
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/35388486470.pdfIn PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/zilikan.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/20190233935.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/fazabaxivivokifota.pdfIn PDF document text
    • https://bselink.com/userfiles/file/16385392094.pdfIn PDF document text
    • http://omni-links.com/images/blog/file/nutapifewagizaruvupe.pdfIn PDF document text
    • http://monikaknoblochova.com/userfiles/file/zaguwup.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_off0000b8ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8AE 16916 bytes
SHA-256: 4e63e306200eae3d1c6fdb2e2742e01fcedbdc22343d1fe912e6fedd070c2aa3
font_01_sfnt_off0000e490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE490 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA7 11036 bytes
SHA-256: 6572d2a1dc4382a2cb1d6e980427e81396be6eff19debd517cf99ef9daebaa93