Malicious PDF — malware analysis report

Static analysis result for SHA-256 88463186f0bc5ea2…

MALICIOUS

PDF

82.0 KB Created: 2021-06-25 12:35:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c3703f2c276c8a0c579e0aed46b32193 SHA-1: 7f1a8c1f3ff9b389b05627130350da2c0696f8a8 SHA-256: 88463186f0bc5ea2e20e49fc3d7797f6d6b19e447d2148e8c5d91e7e8fe07456
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as Pdf.Phishing.Trojan. The file contains numerous external links, many pointing to compromised WordPress sites, suggesting it is part of a link farm designed to redirect users to malicious content. The primary attack pattern involves directing users to external URLs, likely for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://queure.ru/uplcv?utm_term=mcclelland%27s+theory+of+need
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ce8bbf95b---lasopexosidimilemon.pdf
    • http://msslink.ru/userfiles/files/87969231537.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/98p9fsokquogt69ijrc7ds9m43/13485312292.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16082c4b871ed7---9256442421.pdf
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/510s6mfacitt43q2dd0e1nlmdo/gipatulek.pdf
    • http://apartmaji-zunicmile.com/uporabnik/file/rivirisemewujat.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16078a32b16b5c---dutasib.pdf
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/758fcc97d3dd85c9d4df48c91c50f065/50787563507.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/hip573t0ib2d5rm5p817n908v5/42655784451.pdf
    • http://nutrisoilvietnam.com/upload/files/65617494506.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b16f88f1b5b---gowixevujajodivipufutu.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a8ec0cac7---51232674235.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1606e169156eb8---bitij.pdf
    • 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_off0000ddda.bin
67e734ea09ca3185fdb4e4d65af041b1540c50aecce14c35808f65d2a10d736e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDA 10620 bytes
font_01_sfnt_off0000f630.bin
73b71644a25b57ac16c0b6676ee0f8c4b75fa370f6d917d8b3bd9719202c34b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF630 16864 bytes
font_02_sfnt_off00012205.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12205 16792 bytes

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