Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fcc39cb9e9e1519…

MALICIOUS

PDF

86.7 KB Created: 2021-06-28 14:01:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 18e06241d23bd89f2baf93af19781e8d SHA-1: 5872581b81b3b34749600b4b3dd163dbc95a96be SHA-256: 3fcc39cb9e9e15190f99464de7a119c2c1e6a1a0050c1e6b5d97cb504f254d8a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous embedded links, many pointing to compromised WordPress sites and IP addresses, suggesting a phishing or malware distribution campaign. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/3098c6dff10e8e4cada9a305a5734c36/94774980113.pdf
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/1c6ab5d7ed40b59d8ce609fba7d1121a/zasilavurabewivajixitezug.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/920vloh6kg0gkate5tg7j14f27/tepizubikipevulis.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16079eb921756f---jajarolapiwuvuzem.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16074ad4e77a84---90354227012.pdf
    • http://allprintusa.com/admin/images/file/serudijule.pdf
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/40ke92eqclp779nuvq5c7nic0e/wiwip.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609849ab05cb8---wezejalozatevigeboven.pdf
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/95a990db492e06d7b199a93aa807bf69/2658974186.pdf
    • https://digireg.cz/upload/nupoxajunilab.pdf
    • https://bikidi.com/UpFiles/WebEditorFiles/file/vabamemivabaxirudekimi.pdf
    • https://osiindia.org/ckfinder/userfiles/files/75449198264.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/h7h7fp9tb60gevvf4lc55hr8g2/58209136307.pdf
    • http://irths.com/upload_files/files/poledewiwirepugutumugini.pdf
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/898fb7e89d6fe09d73585e535f6b4ccc/jurazivejoxapodevijikapol.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3ab9d52cb---10341726061.pdf
    • https://juhaszautovill.hu/userfiles/file/venido.pdf
    • https://whiteplacard.com/UserFiles/file/80754377691.pdf
    • http://lycee-elm.org/userfiles/file/30102298901.pdf
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/e39f7360a595fd388f10154d09819811/jejexilizasenev.pdf
    • http://dekoblickfang.de/userfiles/file/29250359127.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1609bbe048433a---2378435711.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd28ca19b09---35170386669.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ec16b46c1---fewodomafusamejoribum.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8049ea0d3d---junivewut.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160970199a7284---35121004794.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16080bc3677dfc---zujolewapix.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=signs+of+collarbone+fracture
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f043.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF043 16792 bytes
font_01_sfnt_off00010855.bin
aa548c836fab4443874af0f7d4012558a55dd39eb6096d0d74ae74846e6fb65d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10855 16776 bytes
font_02_sfnt_off00013416.bin
dfa45e81d248d1236ccf7c5ede68f56cd44fb0395991a49c0863fc4b8028340d
pdf-font-stream PDF embedded font (sfnt) at offset 0x13416 10824 bytes