Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8fa7e0cc439b9f2…

MALICIOUS

PDF

83.7 KB Created: 2021-09-07 05:18:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c1082b9dc590cd6b6e9f9bead4bb15db SHA-1: d1b013f327e6564636daed551d2f7376f9a98a3a SHA-256: c8fa7e0cc439b9f2b7dbff05cc95612393f603f471b7e127f394c3ce50a39b8f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm on disposable hosting. These links likely serve as lures to phishing sites or malware downloaders.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://eternaseguros.net/files/files/jojapuwe.pdf In PDF document text
    • http://tz5168.com/uploadfile/image/2021/05/21/file/20210521_001430_136.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/69048744238.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/vufajizawijarofip.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9b7ade017---45257514062.pdfIn PDF document text
    • http://fgosvo.ru/files/files/69445558276.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/jatejutabilifisefapuvixi.pdfIn PDF document text
    • https://www.disbel.es/ckfinder/userfiles/files/rasobofakowagejanuxor.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/dofaraduxokowurep.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/67196128941.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16106b52b153be---pamukogovuwineg.pdfIn PDF document text
    • https://cmoretv.com/userfiles/88700163201.pdfIn PDF document text
    • https://windfreeklima.com/upload/ckfinder/files/tufebuvokibozukolebam.pdfIn PDF document text
    • https://cowik.pl/upload/tobiwoxo.pdfIn PDF document text
    • http://klm-co.ru/foto/ck/files/mowuxigubimiwuvusupudo.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/5b69673e6c3a1982d5a49c265992f41a/36506940410.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/potumemuziniwe.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/zupodofegopejen.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b089bb164e6---xarufufixaxevozasemuni.pdfIn PDF document text
    • http://wirheiraten.de/images/file/27428116892.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/bajopol.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/9b0614f49f2fb1c053c229e8acd9ad5b/nenikiwa.pdfIn PDF document text
    • http://zevkotodoseme.com/upload/ckfinder/files/7553246526.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080298540dee---32958159010.pdfIn PDF document text
    • http://santeh.md/img/files/5515145975.pdfIn PDF document text
    • http://chrisdepanneservices.com/Sites/cds/files/xibusovojoninanof.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/36114444865.pdfIn PDF document text
    • https://binhvi.com/upload/files/kotabolekagibasomolija.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=aprendizaje+concepto+segun+autores+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_off0000dd81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD81 18900 bytes
SHA-256: b8d7a049c62b8e2bb9b38ee3ff35d8197f0ccda20e5fae137cab378a72e5a293
font_01_sfnt_off00010d16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D16 11020 bytes
SHA-256: b1b208e1274d25290092665c144018208fbd198118fdb4e26373016f2ec2f06c
font_02_sfnt_off000126b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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