Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9b4e7e3e27337a7…

MALICIOUS

PDF

68.4 KB Created: 2021-09-05 21:46:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5d794e57f2385584b55c52425eaa0ef0 SHA-1: 01a7eb28cf618971270d29f69cc5adff845c130d SHA-256: a9b4e7e3e27337a7ee5af03ea41b0edf5de5357789a83eabdd3ba62ecaef1d3c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external URIs and links to compromised CMS uploads, indicating it functions as a link farm. The primary purpose appears to be redirecting users to malicious or phishing websites, likely as part of a broader phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pistant.ru/uplcv?utm_term=kenmore+elite+he5t+washer+repair+manual PDF link annotation
    • https://bnbcostaverde.it/userfiles/file/39462601105.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/tagused.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d46d173e33---33336227263.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/6pbca08sgmj1bhl1ua3bkiua64/nijajidexuvebijika.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/haq17eskria3vvmsglji5pbp27/26039961361.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/ce8bcaebb720654cab7086eadd8612c3/47894145765.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ubi3lpqu911r9pbnhpn7tp6kn2/92597376287.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160847cb98ba58---71239895547.pdfIn PDF document text
    • https://blindnow.com/userfiles/file/9356277042.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/vadedozekuvofe.pdfIn PDF document text
    • http://plnjl.com/userfiles/files/rekorevururudamudokutus.pdfIn PDF document text
    • https://hirurgija.me//files/sagedidedoxox.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161190158d69e7---vabotavuv.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/tbebhda0pgm7f7hcp210kf4i66/fapudiwilo.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/701abf9474df49a8c79fb370f973562d/naluxeludotagazatinuz.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/87927605910.pdfIn PDF document text
    • http://berbun.com/user_img/file/20639163483.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ee1ff511b99---vuxuranogabikutawezijow.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/981087444.pdfIn PDF document text
    • https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/4f47963a3e4fce0bc80339ca4ac0e837/tasuwegugititewabixo.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/61t5t5f5l522ttbngpa9fipdk5/94372698597.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_off0000aedd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6EF 14536 bytes
SHA-256: 6be226d48246d1967575303cdffa4dacfb9e0e25fb1efb439e73e46c6203ea32
font_02_sfnt_off0000eb55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB55 10828 bytes
SHA-256: a86559c0cb5c28125c40a25b378dd5c271d82a32938da3d9036bc26d95a5ff0f

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