Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcdacfbfb8743707…

MALICIOUS

PDF

82.0 KB Created: 2021-09-01 05:11:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fa8386117d3fd68a59ab66b7a545e060 SHA-1: 47e983a238258eaf6e945f56d65a19b3329e8bd1 SHA-256: dcdacfbfb8743707097ad4b3f471c55c1116523c2e60b14a9dfc9694018f1bb4
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it's a link farm pointing to compromised WordPress uploads and potentially disposable hosting. The embedded URLs, including one pointing to a raw IP address, suggest an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and URI findings strongly suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/2iedinpntji3uule6kgj1kaedv/logidifobaj.pdf In PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af9681a77d3---62743452014.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/noketogifo.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/nekipexujusulozonotolol.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/75053689937.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/mazatovajunaligi.pdfIn PDF document text
    • http://istvietnam.com/rich_editor/file/76853139271.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d02d6854a0---rofupatage.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/regumodadolimodo.pdfIn PDF document text
    • http://accountingworld.in/singhania/downloads/file/nuluzozulujazedatabaredu.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7b67d0e19---tawaramojesanekojuketit.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/54505999191.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/16084c4452e643---49009026008.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/15854159650.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/904b9fba6d14dd94eeddb8cd270c9379/juwozijogovukegab.pdfIn PDF document text
    • http://skoleniridicu-online.eu/ckfinder/userfiles/files/18851894782.pdfIn PDF document text
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/15jp4g6i5nvq4o3ur7r916m8gq/1922505812.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/lotulupepilawidabamovoxal.pdfPDF link annotation
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/rk13vkk93gsq3cpn9svr6le70h/rasijopaxamedogelu.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7d13d199c---71668874733.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d32f27dc5e---fazigavasobivolusaloxe.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/4ce6fb665f451eea038357272e7cf802/zoxonozadumuwojov.pdfIn PDF document text
    • http://euroinstytut.pl/galeria/file/65492726030.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/cb299db68f31e6837c2120e49f3752f8/keporedabisewonewazojuwi.pdfIn PDF document text
    • http://slovbau.sk/test/userfiles/file/70286235522.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/d29fc89cbce99bb58f393b4580158602/66962057539.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=cheese+me+charcuteriePDF 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_off0000ddfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFB 17396 bytes
SHA-256: a4031322928688fd3168fa7591f72923e9154eb737a72429c9a02bdd02b4b04e
font_01_sfnt_off00010aba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D1 10356 bytes
SHA-256: b483c22f0187a0407866ca08601d6d9bead3b68cb2ea900ede3067a6c1a008f1

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