Malicious PDF — malware analysis report

Static analysis result for SHA-256 43025cff9cb51a56…

MALICIOUS

PDF

92.3 KB Created: 2021-07-30 01:13:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 3be8474a4f0678e3cdf80233d9bfe6f3 SHA-1: 7412ce77467ae47d09230adfe99bc6ecd3fd8cfb SHA-256: 43025cff9cb51a56710e33696302c4d25c6dcbbac2eda87fd6f0bca9542cb0ad
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://atut-biuro.com/uploaded/file/riwusuzatagisuxom.pdf In PDF document text
    • https://aromamarketing.md/img/files/gipepugekadurosi.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5abd37350---nironipezes.pdfIn PDF document text
    • https://luminex.pl/upload/file/sudipam.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ffd7cb816ae---65234923782.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/0554d4311f42d4bb5d967283f2a17c05/64764781151.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad915a88557---juxuwed.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/66308532629.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/duwak.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/voruges.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c17029448f---tiwep.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/913355b3fee433bb7d4118e92afb170a/lozevonukojuwenupog.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/fakukinuzolub.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0a9fbdc0d---lunuguxojimenoge.pdfIn PDF document text
    • http://griswoldremgmt.com/uploads/files/68161284733.pdfIn PDF document text
    • http://www.florentmaussion.net/userfiles/File/92370994994.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071b7d614e1a---mefitavosunogiwasosudikud.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/4e6774105436424c9963285cdfa7dcbc/pimogewukomi.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/2f4d5df45cc2cd5ddafd5784ee126eb9/75359602979.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/912ed82eb3385bd5637d13db20fd8e6a/gamipipagesipa.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/tovilopexezosulox.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/16d23e77a48af0af9052be0406e1f9c0/tidularulovaxetipapajip.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/39000070941.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/revovonotuxupunuxim.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c9b049d4f---vebesuxujewivedo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=daily+breakdown+maintenance+report+formatPDF 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_off000106fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FA 16284 bytes
SHA-256: 487e2310a3dda1db43d65beeb25060016c09e6493b19f80378b996545702ce3c
font_01_sfnt_off000130b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130B6 11048 bytes
SHA-256: a1a1927d9e83a9abe9b5464de066da9988cecced09b74114bc187ae0f6aa631f
font_02_sfnt_off00014a44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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