Malicious PDF — malware analysis report

Static analysis result for SHA-256 f29c32936f782539…

MALICIOUS

PDF

94.6 KB Created: 2021-08-12 11:06:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 244668a5f88415db1ed545febc1a2f83 SHA-1: 2a9b730eb01aec53188cf63ccef020b8d208ef31 SHA-256: f29c32936f782539f34a85b3b56a198576e56daee8ca65464a63b8b28ef6d0cd
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating it likely contains malicious content. The heuristics reveal it functions as a link farm, with many URLs pointing to compromised WordPress upload directories, suggesting an attempt to distribute further malicious content or phish users. The presence of external URIs and link farms points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/dfbeeb45016a214a64b4260ecc9b33c5/14655006746.pdf In PDF document text
    • https://tecnomatec.cl/upload/file/zagobubo.pdfIn PDF document text
    • http://meta-min.com/files/62815503958.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/36733811661.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/18395a194d87518053886657d76c5a2e/vuguzex.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073bf680efd0---11009737168.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/e14fa73e320701165a222b9d159f00d2/ronawibuwekuvesirib.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f06639b913---nuvonewipemuroduraribo.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160731a61f17b0---zitujokatujetarage.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b81d6dcd0e---21308074504.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/e180b85374d9f9e8439501261f224d0a/85269410867.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/048e9821b9994a2f8cfa45c7ec397f8a/61804060624.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c7363eb31f8---40252272501.pdfIn PDF document text
    • http://accronline.com/userfiles/file/kujarolovefa.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/fonoxopijev.pdfIn PDF document text
    • http://hnsunnyfood.com/d/files/7633039642.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854a208c4b9---welijafoxuluvol.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160984bef399b5---71488580834.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/kefupif.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/gedurexanize.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/13278092374.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/47601345181.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/safifejukive.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+get+around+cape+verde+islandsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF634 17304 bytes
SHA-256: b090cdd885c59acb8938a6fd247d937c45744a2f27eb2ae5c7e06724d5640475
font_01_sfnt_off00012290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12290 10932 bytes
SHA-256: 611cb00b3fbb8f3f48089452774821f87a7e27a8ee2f428a5df907e30740fbeb
font_02_sfnt_off00013bd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BD6 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
font_03_sfnt_off000151e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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