Malicious PDF — malware analysis report

Static analysis result for SHA-256 19bc8b0b877e2e9e…

MALICIOUS

PDF

90.7 KB Created: 2021-10-12 13:46:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4142b43a2d6eb7e74931ed433eba05f3 SHA-1: 6293668684dbdf131cc5ccdd2211eda16e7cd875 SHA-256: 19bc8b0b877e2e9e73a088da7f19f3c84879a190c2ac192b6e00ffb2abd1efe0
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links to compromised websites, including one hosted on a compromised WordPress upload directory. The PDF's structure and the presence of link farms suggest it is intended to redirect users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://veitali.com/upload/files/99859323151.pdf In PDF document text
    • http://7m-shop.com/userfiles/file/30883159755.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/posupuludifawakajoxuwoxe.pdfIn PDF document text
    • http://gptools.net/userfiles/file/87505628034.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc2cccb2d4---gaboduvotiguwimawuf.pdfIn PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/perabuveriv.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/vokuzidasuzi.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/25222546503.pdfIn PDF document text
    • http://getrade.net/uploadfiles/file/32462864159.pdfIn PDF document text
    • http://pressvaluation.net/FCKeditor/editor/filemanager/connectors/userfiles/file/91583287846.pdfIn PDF document text
    • http://gordostcrista.ru/userfiles/file/bimapenipawowifavo.pdfIn PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/50780614294.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/keroregij.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/49924074497.pdfIn PDF document text
    • http://kd-council.com/upfile/files/sezumek.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/82677492786.pdfIn PDF document text
    • https://truongdongkinh.phapluatvietnam.com/upload/ckupload/files/milojejunatefav.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/18639403688.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613591632c991---xakokugerewimolijalode.pdfIn PDF document text
    • https://bagstyle.uz/images/file/65259021742.pdfIn PDF document text
    • http://trumoi-khutrung.com/upload/files/kidax.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/46f091d1e2708c9f4a8ec5e8692b66e2/49408615578.pdfIn PDF document text
    • http://melabo.com/upload/files/3833602258.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/19042025069.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/56920138964.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/RhDyTiV0TgQ/uplcv?utm_term=inland+lakes+in+southwest+michiganPDF 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_off0000f812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF812 10944 bytes
SHA-256: d99b20d35676640c0ef82c1475b5380484dbb6adf7cde36e87aab29ea785a5cc
font_01_sfnt_off00011115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11115 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12927 19404 bytes
SHA-256: f5ddfefaab787de15a846fbf67d9f8b81ff9edf48891ccadf79478feea6257af