Malicious PDF — malware analysis report

Static analysis result for SHA-256 49cdc3ad7561a164…

MALICIOUS

PDF

190.3 KB Created: 2021-10-05 04:36:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 81174fde5a6ed9b39055ae878203122d SHA-1: 3643abfb118377b51180e917c1d1dae127262316 SHA-256: 49cdc3ad7561a164963ad5276dd05b7030a2427ec277413f45f8a238fc8c1a6c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of numerous links, including those on disposable hosting and with UTM parameters, suggests an attempt to manipulate search results or direct users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://grup-rul.ro/printuri-fi/files/nebixizefumupi.pdf In PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/39446435844.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130404c754f2---xitexejarufobironawese.pdfIn PDF document text
    • http://bapassamarinda.id/assets/ckfinder/core/connector/php/uploads/files/17205833335.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/3a056152c55e4591a8b3b25d0631d5d8/50210681535.pdfIn PDF document text
    • https://dm288.rs/slicice/file/4356764226.pdfIn PDF document text
    • https://geya99.com/ckfinder/userfiles/files/tezove.pdfIn PDF document text
    • http://chernogolovka.inhome360.ru/admin/ckfinder/userfiles/files/kegoluvipesizibazorof.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/36466485737.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/38461767436.pdfIn PDF document text
    • https://hometutorsdelhi.com/userfiles/files/zizotokekekepiber.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161392d60a7b13---nopariravolum.pdfIn PDF document text
    • http://grupophi.es/uploads/files/rapasiguxulidabobeg.pdfIn PDF document text
    • https://serka.com/serka/upload/files/pikijinav.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8bf4a6ae0---losajev.pdfIn PDF document text
    • https://glozor.com/userfiles/file/61787742447.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/35176569243.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/aee417a4d3d333bac12bdd948247dca6/41157127126.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/80800941523.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613f33d1235cb---wanikubojoxefap.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/40998303325.pdfIn PDF document text
    • https://szallas-karpatalja.com/upload/losopovoxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=a+strategy+for+israel+in+the+nineteen+eighties+pdfPDF 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_off00027ed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27ED4 10872 bytes
SHA-256: e916ae93cabaf69067d3f6d1f409663e50ee7d624608017218a7e4fd08b2b7dc
font_01_sfnt_off000297ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x297AB 23440 bytes
SHA-256: 90e4de4f8d4ee196e45fb363ef91b06b8fc6c6bc212df8b850604d87d1974ddf
font_02_sfnt_off0002d3ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D3AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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