Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdd20bfb0d415d96…

MALICIOUS

PDF

79.9 KB Created: 2021-09-02 08:34:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 03cb685a609a326e791800808e595909 SHA-1: 4122b959979b95fff88fffe8b6256d0f341c87d5 SHA-256: cdd20bfb0d415d96639783b113136dd9eaa67f72fed388dd98dbbd2fbe68da40
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, pointing to numerous external URLs, some hosted on compromised CMS uploads. The presence of multiple PDF link farm indicators suggests an attempt to distribute malicious content or phish users through a network of disposable or compromised domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://webhenevents.com/clients/868374/File/85405174623.pdf In PDF document text
    • http://astro2sphere.com/admin/images/file/jesokepawux.pdfIn PDF document text
    • http://offerparts.com/upload/files/lavumumulajakix.pdfIn PDF document text
    • https://kartplast.com/resimler/files/femovawifeduninum.pdfIn PDF document text
    • http://laduses.nl/image/file/jilixe.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/76200478011.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/jurerebemeladibemedit.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b276b1da914---rilekojisajimelogafimenu.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/juvam.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f2f40d0c000---tiwoze.pdfIn PDF document text
    • http://polletnv.be/uploads/files/zevukape.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/tesazadovulaniris.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/5d034d0eb48c75e985fe26461ff15fab/winefojekepesekuv.pdfIn PDF document text
    • http://cloverdiamond.com/file/ruvomu.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/79776375735.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/0e0d550d4d954d185a505fe19ee8f396/80718881194.pdfIn PDF document text
    • https://phukienbep.net/media/files/29531749522.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/88556526537.pdfIn PDF document text
    • http://qdsenfeng.com/data/files/rebexigenadaxijavazik.pdfIn PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/83936706213.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160847744851e0---seratefuzikivemul.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/safuwibekinisebolamagexek.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9972a78c8---mufefefifibinexop.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/femososubovutijuzesadatiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=good+answers+to+what+is+your+biggest+weaknessPDF 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_off0000d2d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE9 11052 bytes
SHA-256: 02c4841e63ac217d0c58fb289f6512f046f748bdee6bb0c12f8a40312837b2a3
font_02_sfnt_off00010481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10481 17576 bytes
SHA-256: b8a2f91371c814f413e2f02d6cd3ee5281d2fa1eaf263c839b004850ddd29dcf

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