Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aad2028b3b0e3de…

MALICIOUS

PDF

81.4 KB Created: 2021-09-02 09:27:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a1347c8448d93b62f0dd1393857c80af SHA-1: 767c709a679d2cbd15a22f968289ad5cfd05982a SHA-256: 5aad2028b3b0e3deea0db6222f1728b575a80dc9a066eef50d7e2bb020483269
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of numerous URLs and the 'link farm' heuristics point to an attack pattern focused on redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://infrive.ru/uplcv?utm_term=editable+pre+employment+physical+form PDF link annotation
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9bc1b85fd---17259119260.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a933b926d8---39116733196.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202108200611448022.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/55890208385.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/rasuxomufejitew.pdfIn PDF document text
    • http://unseretochter.ch/images/file/51148646182.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/poniwilogi.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16091c2eb3bb7f---dopirex.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608638680140c---topoxuxosokubi.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents//files/tekowazesodid.pdfIn PDF document text
    • http://changju-hotel.com/CKEdit/upload/files/dinuxanajejubobesezosum.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da1dcb725d---51116691438.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/90060163384.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0488d7215---74934336595.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/m6v97bebhvbddst4mh3bs6mag1/pesasulejekifojumil.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/46173812677.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/ut5bdrfhf2f1n9gruqf5se4nub/sakexevujorepebasel.pdfIn PDF document text
    • http://bouwbedrijfbouwheer.nl/userfiles/file/2451046684.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d90ed4c3e---86782523661.pdfIn PDF document text
    • https://premiersuli.hu/files/files/18970285053.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/vudusawifelivunegewe.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/078f70190417d618c41e7a88ee4b89ec/93731438979.pdfIn PDF document text
    • http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/vapesegikekonofufusoselel.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/iqjkotlj8utis6bq5hqp1vmpip/vevepalosasi.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7fc9c6fa28---49097868179.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/pinix.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pasoruxenamaxagerufon.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_off0000d88d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88D 17300 bytes
SHA-256: 2bdbc6e25e904270cbde5bea45dd8a88c3569ea403ee979c79b85be9ad23c280
font_01_sfnt_off00010595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10595 11124 bytes
SHA-256: 4f403cbc6e1bc2f49a9d36b8eff936dccbe6be3d263d8336dc163688b938ba9e
font_02_sfnt_off00011f18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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