Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff8fa90f3793129a…

MALICIOUS

PDF

102.1 KB Created: 2021-06-29 02:41:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bff144fcb650338619618787cd2d9bd3 SHA-1: 54465df8d2be85348b472d4ada06c8e59d8c4695 SHA-256: ff8fa90f3793129a698aa874765b02f1fdf5a304584680d60aeb4968df1dda4a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to multiple compromised websites hosting PDF files, likely as part of a phishing or malware distribution scheme. The presence of a 'download button' lure further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9711

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 https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/272m97bqfggu8r8c3o2aeshq6d/14773940572.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/96b79be85a5155a3f40be0d530591750/matejaxodepez.pdf
    • https://gilbertems.com/videos/file/33673797377.pdf
    • http://stewartreunion2020.com/clients/2/2a/2a0d9dcdd57715375c9f4393c24df0f2/File/99810331431.pdf
    • http://boxerdapolenta.com/cmsimple/images/file/dejomozokuxubidilez.pdf
    • http://haphadoor.com/upload/files/41143974106.pdf
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/8hont6ab1dcimg1f1dgdb16qm5/53632869886.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b08ea420c3---dotawifanewokone.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160743256c3220---xazorezofumekupavunaxoje.pdf
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/f82f4cf70f0d2d86047971940cc491bb/54489183186.pdf
    • https://atamergranit.com/userfiles/file/kadekijenurakonidudulivaj.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160867092e3940---81897717336.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c0dc06aeb---29799030785.pdf
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/92f1971aba09e384a7d4161a3f961e32/23819737039.pdf
    • http://vyveva.eu/UserFiles/File/xuverenikanefit.pdf
    • http://csc0512.com/userfiles/file/20210624060054_vhyndc.pdf
    • http://alpha-th.com/userfiles/file/24333013268.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607315dd05eb2---99326156673.pdf
    • http://www.prieteniitehnicii.ro/documente/file/11552691143.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9da0a20d54---22697805867.pdf
    • http://interface-referencement.com/userfiles/file/96931192069.pdf
    • https://cleartunemonitors.com/ckfinder/userfiles/files/24518672639.pdf
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bec3e0a9c30---kabud.pdf
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075e4e73c145---83353910627.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=complex+metric+titration
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104dc.bin
b1942931116ecf226b20a04d162ac87deec9ce42adc980f17143cdae7c519367		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104DC 1900 bytes
font_01_sfnt_off00010db3.bin
5e589f41c20ff218bb6ccf029b5519e69688f6dd8b9da0a6254fd2b4fae45c1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB3 20280 bytes
font_02_sfnt_off00014356.bin
42396d0f29ad7fe08bcce7f8e8a42372bea7b2eb3ec0c7c673ff6f0db3540ecb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14356 16432 bytes
font_03_sfnt_off00015a47.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15A47 16792 bytes
font_04_sfnt_off0001725e.bin
d3fde22fab6e1d511ce48ca6ecc2d004f5daa8fbbb8aae71c0609dfc24c700fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1725E 10500 bytes

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