Malicious PDF — malware analysis report

Static analysis result for SHA-256 88cf0cd8881b3985…

MALICIOUS

PDF

87.5 KB Created: 2021-09-17 18:36:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fbdfaee0da539f3b00ed52542e93ffd8 SHA-1: a2e31b415fdc9698ab88c34d7069dfb5c152d099 SHA-256: 88cf0cd8881b39859629cf2c8fffa753d6afd223e5fe65407d1f5ffc7f64b014
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to direct users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://drumlockingclamp.com/FCK_Editor_Images/files/xejafoganotabigu.pdf In PDF document text
    • https://somogyplusz.hu/files/letukaxebedajudikogobi.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143316806e4f---jakubepuvumero.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/burosuneligaditofokawokij.pdfIn PDF document text
    • http://nordicwalkingturak.hu/_user/file/fibudozawubuxoruwelexukap.pdfIn PDF document text
    • https://vinaarc.com/app/webroot/files/ckfinder/userfiles/files/biteneb.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/90458927328.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/93797825645.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/pinodexatupimifiluwibegoz.pdfIn PDF document text
    • http://lpsa.cz/userfiles/file/tuloxasuniserepepotepid.pdfIn PDF document text
    • http://mrhobbscoffee.com/images/uploads/file/wokanubali.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/kemokemowenerala.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/69595290fafcdb7e509e2142185580ae/nekewanejebafixij.pdfIn PDF document text
    • http://modamoda.nl/uploads/pic_lib/file/manaxumijenafoxipomi.pdfIn PDF document text
    • http://archiprojektai.lt/app/webroot/uploads/userfiles/files/jimew.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/23879621484.pdfIn PDF document text
    • http://unesco-mediain.cz/fckfiles/file/60955366069.pdfIn PDF document text
    • https://madeinstlucia.com/userfiles/files/zameravar.pdfIn PDF document text
    • http://szcftz.com/upload/mesetipajukilige.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/7979b47d487f65eebff7f843032f98a8/1974184371.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcf149fad3---16823699515.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/35952582708.pdfIn PDF document text
    • http://eggtesting.com/admin/uploads/file/livokawerezusijiku.pdfIn PDF document text
    • http://avon-bratislava.sk/files/files/ritin.pdfIn PDF document text
    • http://teedinmaesai.com/user_img/file/81637773335.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/rejewijugetijenirevagi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=th9+loot+armyPDF 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_off0000f4b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B1 17304 bytes
SHA-256: c3865e10e254aa72d4113202f08189637a956223fcb61cceee42b2d6ed5c3756
font_01_sfnt_off000121a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A3 10124 bytes
SHA-256: 90360137321b2b6af33093bf1719ad6f3059dd11200853f7d8053db3586adfa1
font_02_sfnt_off00013857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13857 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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