Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3c65516bfeba64e…

MALICIOUS

PDF

70.7 KB Created: 2021-09-05 14:02:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 00856add27a3339ba59141ba8aea1f67 SHA-1: b792f13b8661d6af43cdcff63b79996bf9ed2886 SHA-256: f3c65516bfeba64e643a137db68aa9b885b62567bf2ac26051011d4db9bee4fa
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to websites hosted on compromised content management systems. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the primary attack vector appears to be the embedded link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://master-br.ru/img/file/xanurovita.pdf In PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/4fed48967931e2a2b460fcdebe28514b/godofufunomufawaneguka.pdfIn PDF document text
    • http://stickerbarcode.com/file_media/file_image/file/nexakulolobetutasedo.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/gafefubomezej.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757f30e7394---bikedi.pdfIn PDF document text
    • http://sportsclinicwest.ie/media/contents/file/65512377549.pdfIn PDF document text
    • http://yngc.ru/admin/ckfinder/userfiles/files/bulawuxafisigipo.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/92756937108.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210603142731_a0bcst.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/rojidatakuvewo.pdfIn PDF document text
    • http://webinside.pl/userfiles/file/nalilavu.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c9e02de32---mapurifive.pdfIn PDF document text
    • http://vanphongphamhienluong.com/upload/files/kasumuwavenonubuwun.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/78b35dc89c5a93b6a7e0638a5f554468/galaxuwinul.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/d2c58e8c9ffee76ece79265a75a9d611/gosidutemaguzepozano.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607797c8a1f9b---85047000371.pdfIn PDF document text
    • https://institutdesante.org/userfiles/file/golukiwof.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/f1303690bdef147f60aaea79f07a8e67/kapudidikajigubifamezaro.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/wukisad.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1611545ffdd5f7---tituter.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/ab701629b5974056e718cdc34a8ddbe1/vixoxaseretut.pdfIn PDF document text
    • http://vssteel1999.com/ckeditor/userfiles/files/pivovurojo.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/vufomaleda.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/0dc0dv2usdg8roeenilvkvmur5/62151856986.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=belkin+n300db+range+extender+manualPDF 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_off0000b4f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4F5 11084 bytes
SHA-256: 669c3b109a9dc4fb8be0eff6c808b4bcd51193c43394707b569ab62c741f3465
font_01_sfnt_off0000ce97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE97 15552 bytes
SHA-256: 0f6be60300b2f7b44cf32868d37ec81b9b509c0733e985244a17c562c48286c8
font_02_sfnt_off0000f53e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1