Malicious PDF — malware analysis report

Static analysis result for SHA-256 a62e3ee68c0c6a90…

MALICIOUS

PDF

87.1 KB Created: 2021-09-02 19:15:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cbfdfdcc43e69cb5c4aa8672d65ec645 SHA-1: eb52d1c411770bf4956ebaa595e9ddf185026758 SHA-256: a62e3ee68c0c6a9006e80e12b4e0f72b13179e0795a3e473312dfc8c01af72d0
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous URLs, some hosted on compromised WordPress uploads, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URL analysis point to a malicious link aggregation strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://rgcsmt.org/ckfinder/userfiles/files/tikev.pdf In PDF document text
    • https://b2cexpressdemo.com/userfiles/file/30296147666.pdfIn PDF document text
    • http://www.mediagrand.hu//data/editorfile/semojoxadik.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/29323089617.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/c1939d2982a173fd21f6c40d49074d6e/gapunereren.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gofezebitubifurigifos.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/ngcuac26juvgur57t25kgnhu28/gemumodevejonurogatag.pdfIn PDF document text
    • https://onlinendttraining.net/files/guwunap.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/26j6238rkbdbvumabqslf1c661/95596779702.pdfIn PDF document text
    • http://web5gstore.com/Files/files/gogodepuwobokevenefano.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/2ba7f630308bf6ea0167be84380377e0/17814796186.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ca8957388---16630369944.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/96dffacd722e84f94b0fbda20322b521/99239579980.pdfIn PDF document text
    • https://loctra.net/userfiles/file/62167712751.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725974f224c---42985014914.pdfIn PDF document text
    • https://icbacademy.com/upload/files/vokubudukozapulen.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/kapce3v9qp37l209mc80sm6kam/95320444597.pdfIn PDF document text
    • http://cuacongtrinh.vn/upload/files/10374390115.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612e2d7c469a1---84047005070.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/revozuzunisimo.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/37580262191.pdfIn PDF document text
    • http://vertinu.lt/ckfinder/userfiles/files/rebipaxafu.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/20462346100.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=cover+letter+sample+for+internship+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_off0000eec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC0 18260 bytes
SHA-256: 78382fcfe5c04864a51b5d509ced2e53f4c9e89ee2903ac7d2b0b75289bc6535
font_01_sfnt_off00011d8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D8B 10860 bytes
SHA-256: e1653b22283f80a747c4d8b351459ce2aac410d80b181d584947ad1a51e78b3b
font_02_sfnt_off00013678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13678 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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