Malicious PDF — malware analysis report

Static analysis result for SHA-256 b239cc362e177a1d…

MALICIOUS

PDF

84.4 KB Created: 2021-09-07 05:49:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: de6d3af593a4784e673af265a32b3f28 SHA-1: 6a3baf56ff7150cf85623c2b49d3b55e24c9ac60 SHA-256: b239cc362e177a1de3ff843fd46e6901f4e548d553cc4fcb1e26408c03741d9b
164 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal the PDF contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of a 'download button' lure further supports this, aiming to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://vipdiler.ru/files/file/3091834339.pdf In PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160705436eae71---zuxekimiripoxenebog.pdfIn PDF document text
    • http://isemya.by/modules/ariol/static/ariol/ckfinder/files/10895582765.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/349bc764e45717ae830ce99d13f71c64/44248802711.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/28916456808.pdfIn PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/farevowe.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/97831661746.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/kagebirinesawofi.pdfIn PDF document text
    • https://olivermilk.vn/tctt/sites/aaa/file/70087623653.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/vonefokovafole.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/30520212762.pdfIn PDF document text
    • http://bracyfamilyreunion.com/clients/c/c2/c2db1a97f769835965582c74015c7782/File/41599513455.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/omov77f56m5melmsg2v752ha5t/42773140848.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160913a2a4af9f---23779201310.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736b4ee0274---77570516442.pdfIn PDF document text
    • https://beruanglucu.com/contents/files/fagurilek.pdfIn PDF document text
    • http://goreskyreunion.com/clients/b/ba/ba087d28c24afe6c5bc45fa062332e47/File/pozerawodog.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/77732749980.pdfIn PDF document text
    • http://arablift.net/userfiles/file/31153851114.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0468338001621899994.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/fb59fe8bf5b2292a2acfa7abf91129c9/nilelibikubomikenasapi.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8fac8a53d---zawadaxiruxukobinotam.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/5163808215.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823fcf804fe---dididebesogixegumatumapix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=k53+learners+test+pdf+download+freePDF 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_off0000e22c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22C 18572 bytes
SHA-256: 45d9a85d1844562376cbcf9149cc785657b740db96c134687a58c8a5cf3f9ecd
font_01_sfnt_off0001127b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1127B 10780 bytes
SHA-256: 2303ea3f9f1f9756df82bd93fbd5e2707eef7d1a2eaca8f57c24cbf806eb411b
font_02_sfnt_off00012b8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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