Malicious PDF — malware analysis report

Static analysis result for SHA-256 c84ce0458145efe1…

MALICIOUS

PDF

88.9 KB Created: 2021-08-08 13:17:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8b84ca137424eddcc532892bd8c70aed SHA-1: 612e3106eaf7031c90e3391c8db37dede037a612 SHA-256: c84ce0458145efe16e9a09783db67c7d5eca92bdf4c3e5783dadd1bf556c85ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS upload storage, suggesting it's used to host or distribute further malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs, particularly those hosted on compromised WordPress sites, strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a056d95e156---10361882705.pdf In PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a59a2fe9b5c---83725908972.pdfIn PDF document text
    • http://abwingsde.com/uploads/files/64735156572.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/8e4bb5c0f8d080f1e81d1c9e10bc3f6d/nifegu.pdfIn PDF document text
    • http://smart-ventures.ch/upload/Editor_Images/files/zazudanamuveragolubezajeg.pdfIn PDF document text
    • http://d4sontario.ca/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/51745367476.pdfIn PDF document text
    • http://language-coach.pl/uploads/files/1486025731.pdfIn PDF document text
    • https://pasarant0g3l-turbo-h1t.com/contents//files/45035397802.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/komezidov.pdfIn PDF document text
    • https://schmitz.cz/res/file/85029434060.pdfIn PDF document text
    • https://yildizwebpaket.com/calisma2/files/uploads/66770233493.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/56786076804.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160721902a7d0c---roruvekinugafak.pdfIn PDF document text
    • http://bishnutoursandtravels.in/userfiles/file/99932991089.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/omgri7p8nklg9ki7trfvfr5b40/70602715990.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/pabusilariz.pdfIn PDF document text
    • http://uniqueaddress.in/crm/files/vijimutuwok.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b04c54cfc9e---44772287804.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b092122ee52---pexubedojolozepefapamapap.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16084cfb5b3a1e---47517878983.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd193d93be---86141506999.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/tuxur.pdfIn PDF document text
    • http://geose.ru/userfiles/file/xetokan.pdfIn PDF document text
    • https://visualarchive.bg/files/gisatozobote.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/fbm3a1p3huf7qgtfus3mfhehd0/punitilizavedolizijak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=what+is+job+description+in+hrm+pdfPDF 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_off0000f55d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D74 11100 bytes
SHA-256: b1e37a7e9e8aae857d94cab15dba2916263e68ffdf7c85395de35dbba17a2733
font_02_sfnt_off000126e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E7 17564 bytes
SHA-256: 0565b5f2ad23fa176675f3d1ea45865e58c385c34c600ad7b43ea26b4bb8ae16