Malicious PDF — malware analysis report

Static analysis result for SHA-256 058932f8b14bf735…

MALICIOUS

PDF

75.6 KB Created: 2021-09-02 23:48:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8e70d825564d6838fb6786fddf1e68b9 SHA-1: b7335a1b089b57068a55afdbd5ea4ccd1842f041 SHA-256: 058932f8b14bf73581d285dd88e0c68dfd96bceba5286d0d15ebd4dbb433b021
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The heuristic firings indicate that this PDF acts as a link farm, pointing to multiple distinct hosts, many of which are hosted on compromised WordPress upload storage. This suggests an attempt to obscure the final malicious destination and potentially distribute phishing content or malware. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ab3b78ece---virij.pdf In PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/ed436b83dd6c818a3f44e71b32c8b468/29869493913.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/7b816f612f22ab59630b249ba0c38e82/54452131439.pdfIn PDF document text
    • http://esangsok.com/upfile/files/11846146260.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210525162197131814.pdfIn PDF document text
    • http://gpshardorawal.com/hemkunt/userfiles/file/10166721588.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/76211670502.pdfIn PDF document text
    • http://factory-01.com/js/upload/files/43512904289.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/56915117036.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/29842405966.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/0f9baef202cae105c2da9db74da04e1d/34573733270.pdfIn PDF document text
    • https://machinex-machines.com/UserFiles/File/famirosusubonix.pdfIn PDF document text
    • https://suadienlanhhanoi.net/upload/files/20684921296.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/181530d917a1097b606a28c43007a3ad/nanorore.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6b0a7b745e---43263970231.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/f8d4abf18f3fca7feee9ed6989cdc168/gokow.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/66454302689.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/9614fd48185cdfa7e036ad69f4d8e699/bumilufuwaxog.pdfIn PDF document text
    • http://1960vonsteuben.com/clients/d/df/dfb5e1b83ea85bfdc5ef1da934264264/File/jatikumasuteraxosowuz.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097b520336f7---mefimemojakim.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/235a441d7a93636920108929785d972e/41040569276.pdfIn PDF document text
    • http://gonvvama.net/filespath/files/20210819201212.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/vrd9jcouisve48rdc9oejgspu1/85034824659.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/206b55a40cf7dae45dcbc9db24d31630/81674314107.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/31fb1ed793c9dfff5ed7772aa4654578/3005944787.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=desigualdades+ejercicios+resueltos+paso+a+paso+pdfPDF 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_off0000bd5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD5A 19608 bytes
SHA-256: 1e6663c71d7ef548b60949faf230f5e04545384291155dced1424ade28c5fb56
font_01_sfnt_off0000ef41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF41 10924 bytes
SHA-256: 16aac4cfb5b7ee05e3cb60ae9a07bcd64a80ac9282c3e2f06a89c3974f24ad9e
font_02_sfnt_off0001087c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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