Malicious PDF — malware analysis report

Static analysis result for SHA-256 658fd39a1231bfb9…

MALICIOUS

PDF

76.3 KB Created: 2021-08-07 19:29:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5caa20dab5bf173b39b8419374aa4820 SHA-1: 730b80b722738f1a40f9a500bff66efc7a3118ac SHA-256: 658fd39a1231bfb9ff94aa88436cd1878143071a2eb0860884595216e8305239
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to various domains, including compromised WordPress sites. This suggests an attempt to lure users to potentially malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://medvor.ru/uplcv?utm_term=multiplying+and+dividing+polynomials+word+problems+worksheet PDF link annotation
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1609e97fbecb15---5425004355.pdfIn PDF document text
    • http://hujiangsy.com/upload/files/25830766815.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0e0b704ac---67275463636.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/6ab6a86057c218c91753aef06824aa66/4753961685.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/8b153c0bbc9a5a3676d3dfe762cbac9a.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/tuwolevaxu.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/vutefemutigazaxure.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/48234560040.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/51916436f1f71b1d00b2f3e7e9c41dbc/67695183756.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104408e08a4d---52966712760.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160833fd6277ac---kowotowam.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acc558bfbaa---sadoluvulogujikurumabun.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/61alvq15fvcp8r796hdq8vamk7/80198613959.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/xonesavesuximazexo.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/49298883080.pdfIn PDF document text
    • http://cortabellanews.com/userimages/50507787056.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/eccc11f86c47ad5a2f2715ae4b20c2aa/78656210143.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/gfr6pio2v61445cqsitpnsasrk/ramozit.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/osrcue835j52q06is0pedbeqs0/demivitub.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/29642938087.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/ce1f8e31ab7b5f39751ba60307fa8b0c/fikemeguga.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/psjhim996hn9pp5npo68aukj7s/36341581774.pdfIn PDF document text
    • 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_off0000c504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC504 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD16 16356 bytes
SHA-256: 590a48d9ca55acbfae0827eb183cd7cca82465f6387c6a3f36ae9d8577b27f9e
font_02_sfnt_off000107ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107BA 11428 bytes
SHA-256: 1e00969bd370f7da5708b6d788579d8cb0151d96a2f7c05b9a367c2bb0cc172c

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