Malicious PDF — malware analysis report

Static analysis result for SHA-256 22e88468f37d55eb…

MALICIOUS

PDF

85.4 KB Created: 2021-06-29 12:27:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: dbf79a78ef52983bcd86aa54d98cd12b SHA-1: ccc3fa9938535d725009c604d1067c978632346a SHA-256: 22e88468f37d55ebd6a50850f61969843778a8369e9f2f8a2a4b4113fb7d1953
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that point to other PDF files hosted on various domains, many of which appear to be compromised. This pattern is commonly used for phishing or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://fdscience.com/UPFILE/userfiles/files/kuzudeguwoguj.pdf In PDF document text
    • http://resheto.ru/users_images//fck/file/66139295539.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081bc71bb56e---73495590395.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/50b824b61f3e501bdf6856c253136f74/batowarizabafimuxiseb.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/97305242048.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/37363246259.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/24425274998.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/pisun.pdfIn PDF document text
    • https://europartner2.pl/uploads/85333376973.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/d82618490bd3781db152db066f570934/98614724654.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/te38rohls11kav9dvh3vthoqmb/tubugokiretaripipu.pdfIn PDF document text
    • https://gozdemsigorta.com/hulya/upload/files/xojuxetifofakugo.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/a2d570f083b98476d58fd2eba5d8effd/38193833756.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/c41g1gpk1cp81pblgeb3efgu47/25421331059.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/0u400t228jn6qoo5ap3o65nupe/47529845278.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/174474f4a65ae8af84c2fb5ca930b09e/pubazavitofiwosufiji.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607186fd8df10---torojunomixijewego.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/582b746a3c198e7d567012bfee7a1720/73545721320.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160939742c338e---xuruxafanu.pdfIn PDF document text
    • https://isleo.com/i_photos/file/89332004394.pdfIn PDF document text
    • http://tieclangman.com/Images_upload/files/52576878123.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/zudowagesese.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dc7e9912a38ab2a5321afd3feeb9eced/murivakexizopuxox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=renewable+and+clean+energyPDF 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_off0000eaaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAA 17096 bytes
SHA-256: 5087ea7e0adcbc7c02512ec1d0f5da0feb50a588d36625b5cbc92325a6f36942
font_01_sfnt_off000116e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012efd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EFD 10452 bytes
SHA-256: 8be9f0fe90f4f51d1c888d4a0d0c5ed9b5fc84264bd7fe0bfc8e1c96057d6a26

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