Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0f3bd87624595ac…

MALICIOUS

PDF

88.0 KB Created: 2021-08-03 23:47:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5f05070cb9c4fdb5373f9aabd0eb81c2 SHA-1: 4a951679455511710faca1b0e349575d2113cfa1 SHA-256: c0f3bd87624595ac1c4ce2433f09c04be09d6f6f2301f2e3e76c0f188d0e6d32
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised websites, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure, potentially leading to further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/lugijonakosox.pdf In PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/tpf5rjbuhvrka0l523c4231lc6/mumonawebodediwise.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/15608111029.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/1fc44ab6d816484ff874c1bc252a8fcf/vakosekepoj.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdee028c6e---49592303991.pdfIn PDF document text
    • http://mextro.de/upload/files/sajoxaso.pdfIn PDF document text
    • https://olterus.net/contents//files/46436870979.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160acc25f7c44c---visigulimifi.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e43e46e42c5---numunoritixojufefe.pdfIn PDF document text
    • http://passaicvalleyclassof1957.com/clients/44362/File/rubivupalemenalox.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/volojetabitajiso.pdfIn PDF document text
    • https://immobilgold.com/file/21044463065.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/86096056093.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d41852119---redibutik.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/3fdef367752cd52f4bb035398a978e09/96107285862.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/xavum.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/tejajufuzobudogojede.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773b6d7e39e---69325000160.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/10457719140.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/21829cf85da4d1140d711c798d4904a7/somovejukiwobidukeles.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6e9b939e2---55237370675.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16095a3e98992e---sokun.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/a599b400962f08bf37b70fb125069f31/66500971261.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/1de51f3b030e5ece1a728d681b5f1fe0/73952427324.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/nafowuberekemazaxapugoxaz.pdfIn PDF document text
    • http://hmconcretemixingplant.ru/d/files/neworanipurajawu.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/remobiwibirajove.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=sci+fi+books+pdf+download+freePDF 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_off0000f536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF536 16772 bytes
SHA-256: fd4d8c85212491fd7b833590d51c897f8ea3720c553f66b5047fef4fa7130162
font_01_sfnt_off0001205a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1205A 10908 bytes
SHA-256: cf594e92563babe3bf93c329eb11a9b6bbcbfc763d9f3ee0af42eeaed4f11bff
font_02_sfnt_off0001398c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1398C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1