Malicious PDF — malware analysis report

Static analysis result for SHA-256 81b5a9fd2bbedf07…

MALICIOUS

PDF

82.2 KB Created: 2021-09-18 01:20:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 87541558a85db6c731a989aeda280700 SHA-1: 8a5e73d6b74cbc24e6e1404319f3bb09e2789f50 SHA-256: 81b5a9fd2bbedf07de095007c9a640d5b274bb408315951568b4c8e8355d55b8
176 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or raw IP addresses, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URI heuristics and the overall structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132be0eb2cc1---xadowuxobeturerorep.pdf In PDF document text
    • http://zoo-foto.cz/userfiles/file/baludusevoveliwivakinabi.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/jamopesorufolemus.pdfIn PDF document text
    • https://sma-dfgg.org/site/admin/file/milos.pdfIn PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/davolunefavejot.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145136552b4b---kojan.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/17403789934.pdfIn PDF document text
    • http://spzpoz-zdunskawola.pl/upload/file/59908813816.pdfIn PDF document text
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/82579449962.pdfIn PDF document text
    • http://eternaseguros.net/files/files/rebidejisedelerufi.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/o72ejike05s5snltej1jtj7ph2/pavurabemosomama.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/padidedatipewubanelamep.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613336a4834fa---13588853133.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/76352417294.pdfIn PDF document text
    • https://a-guskov.ru/uploads/files/zugezudokafepugurovumeni.pdfIn PDF document text
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/zetejatukorefiguvugolina.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b106a8cda0---vorugazupelewigazew.pdfPDF link annotation
    • https://dom-titan.rs/files/bagusurogefezeweregotu.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/39149842601.pdfIn PDF document text
    • http://flairpens.ru/uploads/files/79677122110.pdfIn PDF document text
    • https://laps.pl/userfiles/file/96786299049.pdfIn PDF document text
    • http://bosch-elektronarzedzia.pl/catalog/file/zomiwetifilepifebiluj.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/22085984713.pdfIn PDF document text
    • http://soundspace.eu/Upload/file/20917294824.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=where+to+watch+promising+young+woman+canadaPDF 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_off0000d7df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DF 18744 bytes
SHA-256: 1ae573d0d731ed411d696d1ac2a0498e97b81dccf42fa823b0374a04d64498c3
font_01_sfnt_off000108e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E6 11208 bytes
SHA-256: c692fc7aa3ed06f6f52505a432926563a5bf07dc1e798494cec0b0c9154f90d5
font_02_sfnt_off000122e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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