Malicious PDF — malware analysis report

Static analysis result for SHA-256 4700e029269837b7…

MALICIOUS

PDF

84.6 KB Created: 2021-09-17 14:47:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5a790cf5cafdab58a51028bf2aa8eb24 SHA-1: e1c257e604ef43b3eccc0b37a97916554fc3337b SHA-256: 4700e029269837b79f4dba6a30dff8cc5de4267c61aff155401bb4eb9ccc4080
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous links, some hosted on compromised WordPress sites and disposable domains, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://hanyauntuktesting.com/contents/files/tozafuk.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f92f044b8f---68671177633.pdf
    • https://nanyangtextile.com/userfiles/file/27777073921.pdf
    • http://remont-etalon.ru/upload/files/kogegabetewudiji.pdf
    • http://plncse.hu/php_data/file/zaxovo.pdf
    • https://cplastik.cz/data/cms/file/vabamego.pdf
    • http://dakdekkersindex.nl/images/uploads/pabojelegamabutewokazifu.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f78ac46537---nesowuzujigadavoleni.pdf
    • http://unsersohn.com/images/file/939470977.pdf
    • http://koreanhotpot.com/uploads/files/lorekejenobawerutu.pdf
    • http://melabo.com/upload/files/rutetuvumoxujosufelixagoz.pdf
    • http://nfrostov.ru/upload/files/65428478887.pdf
    • http://hevolta.com/upload/file/wijowukomajawef.pdf
    • http://www.niceresidence.net/image/upload/File/46079041583.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613398a429896---nidanejarixegirab.pdf
    • http://dmychadla.eu/UserFiles/File/46571507494.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/a0732da86022551a3b81b758c599847d/89607561293.pdf
    • http://sbriz.ru/userfiles/file/samoxagetepekudavuduf.pdf
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/d4ufed60tmkjfgfn80o7jjo4l7/dakinunajigejub.pdf
    • http://cuatro-pr.org/sites/default/files/file/44892784854.pdf
    • http://instit.ac/ckfinder/userfiles/files/31096733546.pdf
    • http://bptramptour.pl/files/file/27289807768.pdf
    • https://bititechnika.com/uploads/file/xepeg.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=three+wonders+game+apk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc50.bin
eca78e88aa59aa68c80328b4954e5a72f31de81303de419af4053a167b254627		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC50 10744 bytes
font_01_sfnt_off0000f4a8.bin
972934de578e851c57fe676c641ee74d01f3dcb41325d854292ff58d661093e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A8 21360 bytes
font_02_sfnt_off00012d17.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D17 16792 bytes

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