Malicious PDF — malware analysis report

Static analysis result for SHA-256 07b9a9083d1fbc0b…

MALICIOUS

PDF

82.5 KB Created: 2021-09-19 23:30:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 401952c353d292d4c7ea89cedba5149a SHA-1: 1606d0b6750b6689715eb6a90b31ce85537b9387 SHA-256: 07b9a9083d1fbc0bf4e4f46e670d7c1461bf7b375a19e004a39d8ec9195b5465
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites or disposable hosting, characteristic of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

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://ih-consultant.com/ckfinder/userfiles/files/vupazolovefukuj.pdf In PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130a716434c3---73049860238.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/bojowuz.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/gevag.pdfIn PDF document text
    • https://esz.jp/img/editor/files/25346185233.pdfIn PDF document text
    • http://tahyuh.com/uploads/files/202109010626262801.pdfIn PDF document text
    • https://hsiaoying.com/userfiles/file/dunijuziki.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/mizolasoke.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/49610356269.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/rumopin.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name/files/2194502880.pdfIn PDF document text
    • http://launensia.cz/ckfinder/userfiles/files/50963801742.pdfIn PDF document text
    • http://abcgsgeds.friendship-match.com/upload/files/fivibawovo.pdfIn PDF document text
    • http://househouse.it/userfiles/files/gaxagamenisajapametid.pdfIn PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/segesejiwuwuk.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/d0644ea0f975b15143e3aa253517f880/vekemefamegukox.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/vodalatap.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f32ed425c6---16555157932.pdfIn PDF document text
    • http://15881588.com/ckupload/files/maboruvevonavajikifunu.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/87187037871.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop/contents/vetefodivodiwinorexejem.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/xuriwagireril.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/titimanapepogewoxekupopa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=tubidy+mobile+music+download+for+androidPDF 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_off0000dc95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC95 10940 bytes
SHA-256: aff2bdca120807cea82ccbe3f2525eb35921de3e11624921b1a6320750094b34
font_01_sfnt_off0000f5f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F0 18004 bytes
SHA-256: 5cb8d4be9a2ea1b5556c9cf3a56128709428ec13a674db4136d3b16c1f29f2af
font_02_sfnt_off0001240b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1240B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1