Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4b9747f81d997de…

MALICIOUS

PDF

80.8 KB Created: 2021-07-06 07:54:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 120427f762b06d9dc558410a57e61a11 SHA-1: 1644de752f1425705df3a90a6558d895ce6dabf4 SHA-256: a4b9747f81d997dec2bd2d1a5409be809a0a5234a48c74dba3f0d7f669a257c7
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting it's used to distribute phishing content or further malware. No scripts were extracted, but the presence of multiple external URIs and the overall structure strongly suggest a malicious redirection or download scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://cructi.ru/uplcv?utm_term=time+series+analysis+decomposition PDF link annotation
    • http://geyikkimya.com/userfiles/upload/file/mejaku.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16073ae000810b---42672208541.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/21987349092.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/5tigcl2sfjdkmqnir7abtuga67/rerumoberexubofuleda.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad705a4e21b---lorabekadijowapewe.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/dawaxuvujofami.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ac89f342297---vefikabeboxipevudivesiriv.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079916b68cde---vukuruderivakesupavi.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/c91112e88e1e93d48b93b01fe6c69ea1/4895410451.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/d5ea523e16311907dd7c5587217a8d34/lixitapimakibuje.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/68135492143.pdfIn PDF document text
    • http://top1np.com/ckfinder/userfiles/files/23843530669.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16073eca9a8e36---nojiv.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e5361b395---ginatitemitabowotem.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/fc5dd5f331aacd77a7d1d781180a6e84/39516055280.pdfIn PDF document text
    • http://easternsheep.by/app/upload/file/29118963224.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16082ab88c0a41---kemumoxekole.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///56959197566.pdfIn PDF document text
    • http://chromavials.com/d/files/78658190861.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/1509967416.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088f479dee76---botagaxeku.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160751ca80ddd1---fogato.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/250726249502.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_off0000d8de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F0 16396 bytes
SHA-256: 29d0c2b44f308316cd0e61937e5ad1c1436a4ed3cfe7d11f8b37ce0c429ad88e
font_02_sfnt_off00011b97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B97 10752 bytes
SHA-256: 594c25d613ae23109354cb2e5e213c5d293cee89b62796773ab2f077bb969fdd

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