Malicious PDF — malware analysis report

Static analysis result for SHA-256 17645cb497df11ae…

MALICIOUS

PDF

73.3 KB Created: 2021-09-17 05:31:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: c0bf5fb9d269608fdc501a4ef17728f7 SHA-1: e9bced825a253b67da84e08fe4bcc935e00b6a37 SHA-256: 17645cb497df11aea564e3fc35fe5b8cc9a6717a8d20e06f8da2af2f7c234c40
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous external URIs and is identified as a link farm, with many links pointing to compromised CMS upload storage and disposable hosting. The document body is heavily obfuscated, preventing analysis of its specific content, but the overall structure and URL analysis strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://raffaelecavazzoni.com/userfiles/files/favebikuxoro.pdf In PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613ccce43c14f---29432177103.pdfIn PDF document text
    • https://gestionarival.com/userfiles/file/60523498699.pdfIn PDF document text
    • https://deepex.hu/hirek/files/58748431657.pdfIn PDF document text
    • https://securitydm.net/slicice/file/14167520578.pdfIn PDF document text
    • https://borgopitti.it/userfiles/file/56018419804.pdfIn PDF document text
    • http://budgettranslation.hu/sites/default/files/file/2577745266.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/1197333584.pdfIn PDF document text
    • https://keluargamimpi.com/contents/files/86641407621.pdfIn PDF document text
    • https://cancelaria.pl/galeria/file/delosusibadopufape.pdfIn PDF document text
    • http://evrofurnitura.by/elax-furnitura.ru/uploads/files/sejibodogujulabolemajogaf.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/615da9d94b3d1fa406a81b9c0bafe4ee/44946578422.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/ipikusurawut.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16136e8682ae9f---lufowiru.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/jusavometobegijemi.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/femogedebosexagusosudad.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/87039053184.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/mejoparidogujumuf.pdfIn PDF document text
    • https://basundharamart.com/userfiles/file/94118805053.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/zumurekuvekafopivuz.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/muwezoxifeta.pdfIn PDF document text
    • https://ka-base.no/images_content/file/sagedebolixoxowetasuturuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=last+day+on+earth+mod+apk+unlimited+moneyPDF 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_off0000bc8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC8C 10920 bytes
SHA-256: 28c9c7acc07b9453b57e3aaad161c998f21ad8ba0cda99c97a0d75b2a2227a88
font_01_sfnt_off0000d59e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD59E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000edb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB0 16456 bytes
SHA-256: 93b537c55369d24b50f8607208c12e8aeb8544c3270233f681d3c086810f0bbf