Malicious PDF — malware analysis report

Static analysis result for SHA-256 f506d0756fa1b338…

MALICIOUS

PDF

82.8 KB Created: 2021-09-04 18:08:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d0a982c6e80c8af2498a0c4caeeab360 SHA-1: 6c3103c54b3db5042c7e8c32d8d5de3501e4580b SHA-256: f506d0756fa1b33822045a07ef99ba8968635c63fae9922326392571900cbd85
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicative of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are sufficient to infer a malicious attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://drafthe.ru/uplcv?utm_term=kitchenaid+ultra+power+plus+stand+mixer+manual PDF link annotation
    • https://at1-turbo-j3t.com/contents//files/sikeziwikudobovedilubo.pdfIn PDF document text
    • https://daxitrip.com/basefile/daxitripcom/files/vajewomelusiro.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1612042005de00---33273618324.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/36aa6c4e618c9ae3a9691e879b5b3202/peropijuneb.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d82527f965---fagowosefaguwaguzetise.pdfIn PDF document text
    • http://zatexpress.com//upload/userfiles/files/penamom.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/tikabok.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/b95loild8r9l90te4g03118197/gepin.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/db0ae948bf1b0d0693676fc0c7568e34/kefidozexemenud.pdfIn PDF document text
    • http://elpijisystem.com/file/tawelawofajaradi.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074822267900---jurutofosupi.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/3bd374fbc0a393c82dacba60d70b3cfa/75684872346.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/36001814410.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612a2986b678a---22468328824.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/vukexedukowunajevatanopew.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/46131412761.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16085e820882fc---zedej.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1611f972639be4---rizijitokupesinotosapomi.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/18216591609.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/161291b4cb9015---fawaro.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160810a5f1a2dd---96777278841.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/javajolovisiripuvov.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/duvigalimi.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/69v2qpo5sg5fbrrd9qlorpdvs1/41938219318.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b060fb36256---bazinugewagekodabeteluxi.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/15064813140.pdfIn PDF document text
    • 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_off0000dca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA1 17972 bytes
SHA-256: a2113e969b6d440029e78f1de2a5d8c3c624825e1a0d482f0e66311f4b83121e
font_01_sfnt_off00010b2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12345 11060 bytes
SHA-256: 07703255b200147fb9fd9a6429d47eb28c517dd5ea231a9d3bbc253061b717cf

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