Malicious PDF — malware analysis report

Static analysis result for SHA-256 85b052c39da81093…

MALICIOUS

PDF

82.8 KB Created: 2021-09-06 18:32:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2fcccaa02c4d0d5d6e81ac2d1aa0aa72 SHA-1: a571b99e0202832acd6d1d4e4d7afbe269f94885 SHA-256: 85b052c39da81093d8b739f16811685f920db4abb26ba3352cbc686e699260e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs hosted on compromised or disposable domains. These URLs are likely intended to host phishing pages or distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://chcial.ru/uplcv?utm_term=bryant+condensing+gas+furnace+owners+manual PDF link annotation
    • http://tuanlongland.com/upload/files/vonusawununevaketenoli.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/xutulu.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/26273172580.pdfIn PDF document text
    • https://flexrocksrollovers.com/wp-content/plugins/super-forms/uploads/php/files/49hpfqhp37c0e8t6b6tt7kjtv3/zosiseferijozip.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f117bf14c1---sixogedokifiduwetotemu.pdfIn PDF document text
    • https://akconta.com/uploads/files/fijivekikisumosemilipi.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/89225519760fb50e142466.pdfIn PDF document text
    • http://barcelonahotel.vn/UpLoadFile/file/83666694596.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/pusutiwavumobonum.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e182369b0---tizimarafigoju.pdfIn PDF document text
    • http://erex.hu/upload/file/88470695598.pdfIn PDF document text
    • http://ketnoikienthuc.com/upload/files/jozezinafifimezag.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16074186d9ccc0---pebetatopugijipi.pdfIn PDF document text
    • http://citra.cl/userfiles/file/lijuwofujerituxuv.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16071a86b1d0fd---moponuzen.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b54f8b0aef3---30205513609.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8a82687c1---41934404551.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/2lg31bm26fpgg4trtkoblkoil6/gijexamebeduxebebajikot.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/4bt51q100l9e3f3cjv043p8ch3/dibipikinarosomaxu.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078bf665bae7---67208717691.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d90ba410c3b---xedarepaxuvelolatola.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/346afb959d91f7a722919dc699339777/90444198067.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE30 11172 bytes
SHA-256: 8c63ba478a0b172e036bc82cbeb69094ac7f435227c6fe97892f9d67cb833285
font_01_sfnt_off0000f83f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11051 17700 bytes
SHA-256: 50608a8930534de732795bee32baa67c9e789016a07f614429612907653b2db3

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