Malicious PDF — malware analysis report

Static analysis result for SHA-256 78571a322096d128…

MALICIOUS

PDF

86.4 KB Created: 2021-07-13 09:00:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5a3f6743d5c28d820f85dac528c92848 SHA-1: b2fbbb2d6efb73159c05c6f3202f8df610104d16 SHA-256: 78571a322096d128fa43b6e4a6de7b14107a39014d112cbe780ba3aa9f319656
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or malware distribution intent. While no scripts were explicitly extracted, the nature of PDF link farms often involves JavaScript to facilitate redirects or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laborke.ru/uplcv?utm_term=how+to+find+protons+in+an+element
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ca0e72a2fe9---tuzesizom.pdf
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/5lhf6eae551jood95s7fc0b84t/bojawuxuweva.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a255aeb5492---xazodibopuzemedide.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad7e6437177---53293914633.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d39a46baf4---66709245593.pdf
    • http://sunnysideclassof64.com/clients/a/ac/acc4ccb49d7935ca36198347b895393e/File/nonutunuwozudivofe.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087711780e8f---xepiwinozakudikakodajipa.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/b5fb00ee2dfcac8e101a83d8b472e0f6/gupuxogajifaxiwosog.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0f5766b37---xomoduzi.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/3c49992982587be72fa00e7d5f6c043b/dolofewugaronuwukapapa.pdf
    • https://asmitahrgroup.com/ckfinder/userfiles/files/wekabumazofikoraruvajibex.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160cf7ea59907f---25533090494.pdf
    • https://www.verimevzabavu.sk/ckfinder/userfiles/files/92377176085.pdf
    • http://volareinmongolfiera.it/userfiles/files/rumenavojubeji.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16090bb912348a---17466270553.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/e7de788712f80c68c34a04092a2cf0a4/juremefo.pdf
    • http://computerdoki.hu/user/file/vujotiruboxeziz.pdf
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/cm0odo84p0rie6qkvcu2pqfsdt/pisupaweta.pdf
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/q9017ohhiaicmccf8ebqs4eeh4/migeboxafipoturuxuso.pdf
    • https://baxsporthorses.com/userfiles/file/xuvaxugozanakowivezu.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e951e595ba---47446091008.pdf
    • https://theelementrama9.com/userfiles/files/21278850877.pdf
    • http://timeyear-v.com/userfiles/file/28916035344.pdf
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cd857b6ed3d---zexuwaxipegewavudozubipu.pdf
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/464602b58ffec06d6f54f0dc7a9d3c19/buzenerakedima.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_off0000ee30.bin
5bfa6fe222cc9c5d33c6491d578590195b2fc552e1b8b4520810897036f8039d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE30 10736 bytes
font_01_sfnt_off000106d4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106D4 16792 bytes
font_02_sfnt_off00011ee6.bin
9ceda6fa8ab54fc2f66e0939809061320b26603212e81ae790c3decd04b25fd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE6 17240 bytes

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