Malicious PDF — malware analysis report

Static analysis result for SHA-256 40f80e8f6c0db476…

MALICIOUS

PDF

85.6 KB Created: 2021-09-02 21:50:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fee81f7b9f4768e9c62e0c276887fc87 SHA-1: 436f7812cc1200048b39fe6dce6c011d2db391af SHA-256: 40f80e8f6c0db47602f626e67af3d4578324f9cdce28af333d7621176a129eb5
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely exploits a vulnerability to execute code. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories and other potentially untrusted hosting. The primary purpose appears to be directing users to external, possibly malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/2d827ca92ec8fed2a8e9a1ee524a7fe3/wovelidumalutipoputet.pdf In PDF document text
    • https://nakatarikaszel.pl/app/webroot/userfiles/file/mikunukalepoxizus.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/xetufozabipamivopeve.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/31673171063.pdfIn PDF document text
    • http://slp72.com/clients/7/7b/7b902bee17765b19ebdde6030f24742d/File/moboruf.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160be3c3f7deea---71458952860.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5808960bb---99383717923.pdfIn PDF document text
    • http://oilandgaswork.com/userfiles/file/vezipeletamaxukowafa.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/patitaxumijokunipobibewa.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e509a42c4---78398506746.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f919a3917---52868522441.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082bb0860fee---zosujugowexiwanogofoki.pdfIn PDF document text
    • http://tchid.net/userfiles/file/ginekumusezexomilaf.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9be3be66f---retisov.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/tufizozir.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612cd32a56f5b---98720739631.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/tamukelokolumewibu.pdfIn PDF document text
    • http://willbramephotography.com/rusotituxububeba.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/dimozuperarukabunikogeto.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/8ps3vpgjbhhamp6e1hug4vkn5k/53162814482.pdfIn PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/dopolexigezepirozagemep.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/ligezi.pdfIn PDF document text
    • http://synergyproperty.com/images/files/worolazawigososulixitiw.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/xikinavabuwaruvidix.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/d5a3d9bca26f580e8a94142de0c378d7/sumuzukenuvizeripifubijuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=jurnal+participatory+action+research+pdfPDF 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_off0000e6d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D6 17880 bytes
SHA-256: 2b37c6bb29322e4e67746b57ae6bda9a7ca9c643067041464473be7a323a8cc3
font_01_sfnt_off00011571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11571 10920 bytes
SHA-256: 7b1581d6b50bb1e9ff03459ce43d5585c4d32d560a6b2c40e0a4faf5fa7eb33d
font_02_sfnt_off00012eb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1