Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bb0ae409bcf0e32…

MALICIOUS

PDF

82.0 KB Created: 2021-10-11 15:26:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 959863d8b191639326c25c1810d855a5 SHA-1: c3b14180ecac993d90f89aed7039f6fceb671bf3 SHA-256: 2bb0ae409bcf0e32d8e428f2af4027e353015d58edcf955a238b15b1a5955f99
156 Risk Score

Malware Insights

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

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, with numerous URLs pointing to potentially compromised or disposable hosting. The document body is unreadable, but the presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest the intent is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://autoscuolapezzano.it/userfiles/files/pesami.pdf In PDF document text
    • http://ottotech.center/userfiles/file/64326416545.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45517693442.pdfIn PDF document text
    • https://indiansabroad.uk/userfiles/file/susepubuvebomujebijafuve.pdfIn PDF document text
    • http://koreadramatour.com/FileData/ckfinder/files/20210909_50146A333B29D024.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/pedekinerixamatakazi.pdfIn PDF document text
    • http://sjccgy.com/userfiles/file/mulamawafuwu.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/52571335765.pdfIn PDF document text
    • http://doorsatyrau.com/ckfinder/userfiles/files/jituso.pdfIn PDF document text
    • http://thoitranglani.com/upload/files/rojajigasiwigada.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5b523dfcd---44663242349.pdfIn PDF document text
    • http://decaiyun.com/upload/file/21090402520399595429s6dnnak22i.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/dodoto.pdfIn PDF document text
    • https://suadienlanhhanoi.net/upload/files/zixotusokodokazovo.pdfIn PDF document text
    • http://surausa.com/uploads/files/tuzuvugilega.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/ziluxoja.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/161449e275a208---21477841532.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/nosonujumepinuderososoloj.pdfIn PDF document text
    • https://cmf8.ir/data/file/livexe.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/161585595a573b---48663737971.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/kofonixevep.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/ceff01b9050586f213a297c6f05259d2/zopapurotuminurebifazodow.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109290107359673.pdfIn PDF document text
    • https://nissanzorba.ro/ckeditor/ckfinder/userfiles/files/livalitope.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/fuxiribazevirado.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/54073392232.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/RhDyTiV0TgQ/uplcv?utm_term=past+perfect+sentence+structurePDF 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_off0000da25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f23c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23C 10316 bytes
SHA-256: f6e13698c23e5a208ecd0d11e31936f96095db1a1e75fb3f2a7fd27ab81f8142
font_02_sfnt_off000109aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AA 18652 bytes
SHA-256: b91ff41e86b9238bec0fe42f2344e2bbd56de6d95e1376c0fb32ef4a1004553b