Malicious PDF — malware analysis report

Static analysis result for SHA-256 875d99d2e3ad8ebc…

MALICIOUS

PDF

98.3 KB Created: 2021-09-05 06:20:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7338908dfa5521b7abaefe0842b15ac0 SHA-1: e505a923077b5e4d8f62442dac80a5dd3bc8f56f SHA-256: 875d99d2e3ad8ebcb389432302e1308a5853a96be7e7595622e0e898fb097751
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous embedded URLs point to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, indicating the document is designed to host a large number of links to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://irlanc.ru/uplcv?utm_term=cdc+prevnar+13+vaccine+pdf PDF link annotation
    • https://mimpiindah2.com/contents//files/89578033184.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/364aa1b024fc4954e657ba2329f8d8aa/93512774984.pdfIn PDF document text
    • https://wrd13.com/force/file/piluvinuwopowoxomudafob.pdfIn PDF document text
    • https://laflammerouge.ch/userfiles/files/lifubonopifove.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/9478c0ab58b5d21cd385aab9055827d7/22561955684.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/nalenafado.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/90910276726.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/69815261336.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a7950bb1d99---86243997443.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/43729473003.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb3e438536---diwutomowononimokono.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160ab81bba2279---57296334100.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/79971705043.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/dubevapulogowavofedu.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/5f8d71cf7ed3eb1097bd410abe629c4e/fuxoferekusifubakeg.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/d43923b1038725cdacfd9721d38ccb21/62202052428.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d22d0ee8df---42818473489.pdfIn PDF document text
    • http://inspirationforexcellence.com/clients/66491/File/bitopufowixuw.pdfIn PDF document text
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/hb7ftkt3g5ga3clts6tu94r9qg/tibetiz.pdfIn PDF document text
    • http://poultech.net/d/files/bugimexozelejuneze.pdfIn PDF document text
    • https://bbgpiti.com/userfiles/files/sazanakuxom.pdfIn PDF document text
    • https://skvacations.com/userfiles/file/lojekimepezime.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a541cb4df0---balufotodegigofatesuwu.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/62cbf3777be8b388aafd5485fbb50546/82297644360.pdfIn PDF document text
    • https://iwistw.com/upload/files/tudibobutukixedaruta.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_off00011be7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000133fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133FE 10500 bytes
SHA-256: 6d746d51ba4b6f116f94ec65b1d6a7ad17b88fe3a574f91478589d56e6b65088
font_02_sfnt_off00014c08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C08 18236 bytes
SHA-256: 9f1692bf365cd4e77b44a3d554b0720c13a8c00f9f02e14030698d98a0fd7b2e

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