Malicious PDF — malware analysis report

Static analysis result for SHA-256 2db223de842e1255…

MALICIOUS

PDF

86.8 KB Created: 2021-09-17 07:55:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9e14814f690550aa6bb340cc281d865f SHA-1: d0b7117afe2f92a6cfc5c99d30e014f0f82c292c SHA-256: 2db223de842e1255dfd464acb3e9935b8875d3e4393c28519dc4655a03a07dda
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of techniques used to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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=itunes+movies+on+android+tablet PDF link annotation
    • http://marjoleintje.nl/include/userfiles/73654965432.pdfIn PDF document text
    • https://cuatudongsaigon.net/uploads/files/94614570457.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/77558844387.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/86450413240.pdfIn PDF document text
    • http://popeyebio.com/upload/files/korenenudatur.pdfIn PDF document text
    • https://keyseries.us/userfiles/file/9954408319.pdfIn PDF document text
    • http://101balkon.ru/upload/files/63423808018.pdfIn PDF document text
    • http://teamtrinity.net/trinitya/file/zarobewimokopapa.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613349af25831---feful.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/n04dqp337pn553n0fijv0rcc5b/tenararozawubalo.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/gititova.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/vuferusonujupanukod.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/161381e9d14361---79578163673.pdfIn PDF document text
    • http://pronobile.com/catalog/file/vobiriwu.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/70175267304.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/mesozipixugu.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/wunesowibafesepamov.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/4736625631.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132527e31324---woganesafuxuxil.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/rikenaludozere.pdfIn PDF document text
    • http://hamyarsanatco.com/ckfinder/userfiles/files/kexir.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/19024712899.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612f61cd2c367---34616366725.pdfIn PDF document text
    • https://acconpriti.com/ckfinder/userfiles/files/45515015096.pdfIn PDF document text
    • https://contemporaryteas.in/admin/uploads/file/74297462112.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/gobewuru.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_off0000ec7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7D 18716 bytes
SHA-256: b62c245733ef1d2178a7d613d995b3401b7514bb3d111b4c1ad87bbcfaaf177b
font_01_sfnt_off00011d3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13555 10664 bytes
SHA-256: 738ad0aef02be44bd31f8351b027dc960ba3c096f03059e2cfe17cd3154562a0

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