Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4709c9fa77efd81…

MALICIOUS

PDF

80.3 KB Created: 2021-09-17 12:21:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a75f74fc01257a84eecf188b33bdec4c SHA-1: 3ddc14add1746d1a48f7a77807e92c40e4aee49a SHA-256: c4709c9fa77efd81976a52ca06284c03aaa4b7cda8073c8ec2318e6c267cc546
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some of which are hosted on potentially compromised CMS uploads. The document body is heavily obfuscated and unreadable, suggesting it is not intended for direct user interaction but rather to facilitate the redirection to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://matstravel.ru/userfiles/file/ludekujifa.pdf In PDF document text
    • http://kdwatch.net/upload/files/2021091610243881.pdfIn PDF document text
    • http://stevis.cz/files/file/17136774169.pdfIn PDF document text
    • http://jimsclub.net/new/board/img_tinfo/file/20210903210127.pdfIn PDF document text
    • http://webs123.com/userfiles/file/dikalagemizalifodozuxita.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/881e033f674e211371a53a21e86cceed/javejomug.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/disobefekonigu.pdfIn PDF document text
    • http://trubaopt.ru/content/file/10157492146.pdfIn PDF document text
    • https://codecs.ro/images/file/tarewalitigikajini.pdfIn PDF document text
    • https://www.vignolaweb.it/ckfinder/userfiles/files/38934606754.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d736b8a991---11667452397.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/927437756.pdfIn PDF document text
    • https://pisangmanis.com/contents/files/wobetewasupinab.pdfIn PDF document text
    • http://polenes.cl/userfiles/file/wizumodip.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/voduzaxuxobexu.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/86145066953.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/f217e730338c35db9d6f137a4c5ac419/81173209264.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/bipenigodukog.pdfIn PDF document text
    • http://sjhtractor.com/d/files/bajezozeji.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/vanarupeliviziwusuvipi.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/1802f177fc19fadac0104e43ed3354fc/29511711835.pdfIn PDF document text
    • http://phulieumaymacbaoco.com/hinhanh_fckeditor/file/nujonizogige.pdfIn PDF document text
    • http://yildizteknikelektrik.net/resimler/files/tibafubivij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=format+of+this+video+is+not+supported+by+chromecast+mx+playerPDF 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_off0000d47c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD47C 17252 bytes
SHA-256: ce635186d8a59347affda07d6b2b0147cd98372598d1ba91fa7d8abb8e0ae692
font_01_sfnt_off000100c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C5 11384 bytes
SHA-256: 2b0ae41ea4eb5ad8e8d38631ffd4eb9335f37d95c8c94c6765a0e151c3c49d1c
font_02_sfnt_off00011b3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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