Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3b9b4469e252434…

MALICIOUS

PDF

80.9 KB Created: 2021-09-09 12:15:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6990b941e8e7d1934b000e1ed383a9e6 SHA-1: 9da5cbb98071181bf6c9752a66bcb1973699bc50 SHA-256: b3b9b4469e25243498489fd2bb8830b98f45055d65a03a8284a0e89606f813ce
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a phishing lure. Specifically, it requests sensitive recovery information such as private keys or backup codes, which is a common social engineering tactic. The document also contains numerous links, many pointing to compromised CMS upload directories, suggesting it is part of a link farm designed to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/9f4ab3b05040ad529e6d7082f27b9789/34931251016.pdf In PDF document text
    • http://maksimetall.ru/files/41477976817.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/23127989936.pdfIn PDF document text
    • http://netichikawaya.com/userfiles/file/kujararunake.pdfIn PDF document text
    • http://protok.pro/upload/files/85796714930.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/11225523665.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613792dbd6769---65643700164.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/78049129120.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/wogozotot.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/wekulerer.pdfIn PDF document text
    • http://biometria.pl/photos_fck/file/vugufazazakivutumigatilu.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/57932071835.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/09/202109071525417749.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/42145631681.pdfIn PDF document text
    • http://universalthailand.com/images/uploads/ckfinder/files/46271357653.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/c7a00e342369e3bd84188bf3e1422fd1/gaverudavazuwur.pdfIn PDF document text
    • http://e68momo.com/shopadmin/upload/files/20615544170.pdfIn PDF document text
    • https://betsin.org/userfiles/files/51414346966.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/jogazogipeki.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed1545e163---62007798929.pdfIn PDF document text
    • http://toszegisuli.hu/userfiles/file/38864437127.pdfIn PDF document text
    • http://anshan56.cn/userfiles/file/16309469522064576297.pdfIn PDF document text
    • https://praktijk.zorglink.nl/ckfinder/userfiles/files/51064471960.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/29451133986.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/85102296689.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gadexezegapotulabij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=long+oa+wordsPDF 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_off0000da49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f25b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25B 17500 bytes
SHA-256: c3948d9ec11c188168aa7b8cc1ba0607e855cb4616c0bc9020292a5b692bf053
font_02_sfnt_off00011f84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F84 10096 bytes
SHA-256: f7bb06d13091ec44a46dbce6d85ea947cebc656411878959ed5272de4bb10f85