Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e72f2c655c03ac8…

MALICIOUS

PDF

87.8 KB Created: 2021-07-19 16:18:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5c5dd09fd75320f2ea4e97ef7e6126a9 SHA-1: ab550c19b5799d7a151e6ff3b4985cfbfc87204b SHA-256: 3e72f2c655c03ac889407886c47d2eb45c4e2b700c85be4cea0897dd1b2d8d2d
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, which in turn host other PDFs. This structure suggests a link farm designed to distribute malicious content or lead users to phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160aabe15193ff---kijerezimatididom.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/4cd961f5ff07cd68b3392143dfa0d658/36791427327.pdf
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/gkqmjrv2qdrn8uj04ss3vmt1ut/bakutanuno.pdf
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/054a2370c800c64da2efa9e74d6ca702/jilegog.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e935f5a524b---vagobavag.pdf
    • https://coil.hk/upload/files/4106258490.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4943f104cb---tasiwiz.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7156b2e3e---papawegazanujukogonomip.pdf
    • http://www.emailposte.com/pictures/65685611089.pdf
    • http://zeguvietnam.com/uploads/ckfinder/files/57671763298.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ce946c3a9---kejopurugupuje.pdf
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/ats603dt7b41uf6ken7ikp3dev/dedizudumos.pdf
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/453e91b5001f67b2751aa90fa9106d7f/tojixodes.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/1d8vcsbmfelvkvsgj3740sgkf7/64514928367.pdf
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/4b8590273d2b1183ade7937433e1e46f/32539719719.pdf
    • https://bnbtravels.com/ckfinder/userfiles/files/tulotidumozo.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ogkntat8n556cv5cjir44jiie3/98002563850.pdf
    • https://cissud.eu/uploads/ck_editor/files/60072322653.pdf
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/9nmugac36slf5coe4vskj9pdol/xurolakatavebibovasabopub.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607943fcddfb9---75017081335.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/7ce5d174f8bf7459eb53b81e7e532474/juviserojamojimi.pdf
    • http://www.derbysignandgraphics.com/uploads/file/63657828014.pdf
    • http://theettiaresottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/95927983625.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=what+is+your+greatest+achievement+sample+answer+for+freshers
    • 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_off0000f034.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF034 16792 bytes
font_01_sfnt_off00010846.bin
12829c5b0f8696e5197b35f0632805cee17ef4cf33eb15d3868789cc44f00c34
pdf-font-stream PDF embedded font (sfnt) at offset 0x10846 17320 bytes
font_02_sfnt_off00013530.bin
c175d2805cae53316799587cd7db53045e57c7f09eec42502a7148fd1a227335
pdf-font-stream PDF embedded font (sfnt) at offset 0x13530 11288 bytes