Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8ec9915307050f0…

MALICIOUS

PDF

191.1 KB Created: 2021-09-02 18:16:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: c79746e0575b3b9874112ea7b106aff2 SHA-1: 2dc02d009524a7cf759b9f614d67d7c3e36b5143 SHA-256: c8ec9915307050f08bd064675e418ee3ce505d524557ae5f7a89802387ee76eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised websites or disposable hosting, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these links. No scripts were extracted, but the structure and URL analysis point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://hogies.com/includes/template/uploads/file/63041439224.pdf In PDF document text
    • http://www.majbrno.cz/uploads/files/rexevuf.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/2105191938291864640twpmr.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d6552d4a42a---7607278163.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/88113874761.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160899a2d68b4e---redefozasewexefijegid.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/pisimetekefu.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021062607525373499.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af6c4c2e5a---32475914867.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ccdfad88e02---81408082389.pdfIn PDF document text
    • http://prestopc.it/upload/file/kumojakagopajogutaxew.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e9310988fee---34428796623.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740b43349c3---85043923468.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/oq3mb38oce5221tlfrar3ag6j0/ranawuf.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/zevivesatizijo.pdfIn PDF document text
    • http://deauville.ru/files/file/vobijomukonotakare.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/nujasebanajofisinabemunan.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6a230b580---vapevas.pdfIn PDF document text
    • http://bellsazshihtzu.com/clients/878694/File/saxavawofuka.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608049f4d9be8---foxodo.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/f8d8c26a82089ec2a65a22a903079ffa/70676692273.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/bedae3f38268bb981d0acc3ddd5f72df/xekelipul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=company+law+2013+bare+act+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_off00028c3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28C3D 18060 bytes
SHA-256: 26b73bab18eb87c0965522653c3be5efa18e68413d73994765fd96d8baa8d8cb
font_01_sfnt_off0002bac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2BAC8 11360 bytes
SHA-256: 2cd63d1ae851b9315fedd8fdbb303c75a56c3cc793c4c50ac1818e3734aaa649
font_02_sfnt_off0002d583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D583 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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