Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a5379ed120b370f…

MALICIOUS

PDF

75.4 KB Created: 2021-09-06 02:21:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1699830cb99287d31bd3727027a3b7f1 SHA-1: 27aa77e6d8923e46f8c6653a87d0003fd1cd8587 SHA-256: 0a5379ed120b370f25a9695723fb49e482f4cf0b1761ec9a3ca8f119bff6d020
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as a malicious PDF by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to compromised websites and disposable hosting, likely to redirect users to malicious content or phishing pages. The presence of multiple links on compromised CMS uploads and disposable hosting indicates a deliberate effort to obscure the final destination.

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 http://agataklimowska.pl/userfiles/file/zurijetowekinuwab.pdf In PDF document text
    • http://hotelalbicia.com/userfiles/file/86858281600.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/9083451e3199cb5883582b9650d7aa3a/volininusilurogeda.pdfIn PDF document text
    • http://odumakus.com/uploads/files/36579738390.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/joladeweturit.pdfIn PDF document text
    • http://dalaichau.com/files/60564812378.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/0cca2ff8a73c5be2963564254f106c79/44435659885.pdfIn PDF document text
    • http://ozari-ua.com/files/file/kosij.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/920510479.pdfIn PDF document text
    • http://hopkinshigh1961.com/clients/878968/File/xileno.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/fupojesare.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16073a106d7312---fenetawizagul.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/65426790780.pdfIn PDF document text
    • https://panificiopasticceriabattaglia.it/file/94091929585.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/fikubogirimik.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612ae0b9c723f---zobakumitanotilojibada.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/29374388448.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/d641027d9f9ee1af469f55a470fa330e/14651924222.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/48925559822.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16089e81d151ef---lodawesunov.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/30d047229273a33b834dd5122f423b03/54353990157.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160eca963bc889---wupegizidezo.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/98016998971.pdfIn PDF document text
    • https://vasutaszeneiskola.hu/ckfinder/userfiles/files/kemetopuwi.pdfIn PDF document text
    • http://sbkf.org/files/files/pifowojifubuzojanupivut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=pradeep+chemistry+notes+class+12+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_off0000c2fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2FD 11172 bytes
SHA-256: 2258285c434603498d8fe2826ae16c33ec910be776d9078ec65eb1e81db0a5b1
font_01_sfnt_off0000dd02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF514 16652 bytes
SHA-256: fae2385cb1c4fbc55969fd9f3bcf7fa345d03767c5d0fe913175eed40a37521b