Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d9cf19d1c47898d…

MALICIOUS

PDF

108.6 KB Created: 2021-07-26 10:44:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 028b41e3a1dcc4bf25439db5dd44db1a SHA-1: 16f76ec434b9a1b8fb976c872079009b870cd81d SHA-256: 0d9cf19d1c47898d97c7f88566cc52b2efb82bbdae1a55582843800bdbb3ac55
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS uploads or disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://pusancard.com/userData/board/file/bizogefepupi.pdf In PDF document text
    • https://kaptenhoki.com/contents//files/33092012696.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/5ap6sm8h2jqn7dcve0j1qj4j2o/zukasabuvafedodizib.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/kvg5k2hpq20ulev27ovtc9kn5m/kosuw.pdfIn PDF document text
    • http://strap.sk/uploads/file/sovozaxuvofedufuro.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/pupkvl4i6bn5pddtm1s8ih9kq6/lezajanisew.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/7397953284279bd03237aef8a5cfa2f7/205787761.pdfIn PDF document text
    • https://sanxuattrucauthangkinh.com/Images_upload/files/2084687125.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/jugurudojoxegopolixigis.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/1bv8agpqlsum588g6j0eark1do/75332566979.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f2469153c5f---darufutavinejiros.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/tinerukifu.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/libena.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/5a85175278e885c5a9de161d42f286a7/nuxomoxipomifebirukeve.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5c1525ca5---lezuzepawabagilugoluxupes.pdfIn PDF document text
    • http://soflocops.org/clients/83264/File/4885167272.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/21485290123.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608451aa1d84b---lubaripe.pdfIn PDF document text
    • http://matras-devison.com/upload/file/fekolepurur.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608dcdc203bf7---68312373997.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/4ip0v9orhg81026pk3pvr809if/zegixuxinirikanumag.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16078b7ec4675d---rawupupapegeviwuder.pdfIn PDF document text
    • http://bociany.sk/media/file/24795577157.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+fix+champion+generator+pull+cordPDF 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_off00013f32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F32 11176 bytes
SHA-256: ba068061fbda9baea0bc56029576038c3c3945f2a8d65a4758051333d804309a
font_01_sfnt_off000158f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001710b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1710B 18960 bytes
SHA-256: e6ce69634712ce0e4e7d9a9be778597a09910eb081adc0dc744d9588b112871e

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