Malicious PDF — malware analysis report

Static analysis result for SHA-256 c94d78ef1b1165f3…

MALICIOUS

PDF

77.0 KB Created: 2021-09-03 11:52:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cfb1c54c90acd79d0c442921695232f5 SHA-1: 7868f7fb89231ff4b56821da5439276f869f59b8 SHA-256: c94d78ef1b1165f3d1a33a08c134d792f4a419a9b0fe2baf391d9e1cf24651ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to compromised websites, indicating it functions as a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity, likely leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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=iata+security+management+system+manual PDF link annotation
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/5c8359cf128e0579506bd26ba2014042/lapamumivopofatixezewoje.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/palcakccli736264r4lbmiai25/20808044812.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/lavibu.pdfIn PDF document text
    • https://havanic.com/cache/fck_files/file/4412220474.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/lidusuvikokuwa.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/76056986634.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/pasam.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/1c3e5bd92db963da55c1f7d33e097c03/421473263.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/tegofununibukeduniji.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/dc335edf9e5dcba1f458b1b412690572/90168755701.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/3e673a701e2048b4fc78639bdc5c3c0e/29711460958.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160983b26b517a---xewopekibazepimivizotopuf.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6d6c4d5aa---sevesada.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/mifonepujenodafepa.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/52179042000.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/71579885904.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/60038472510.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/dfb137446473fa5346360e261c96d8f9/74867599392.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1610ffc89781d7---rufewuniposufubataz.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/3895570657.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1611fa98f8faf0---webetopun.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/gejikodad.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ceedf4bc1fd---14523901429.pdfIn PDF document text
    • http://fuga-hotel.com/CKEdit/upload/files/33552254684.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_off0000c832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC832 17656 bytes
SHA-256: 599f6e210c5ae3135800f211aa656cf2aefe3b68ab76e4ad6df0da5926accb42
font_01_sfnt_off0000f5a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010dc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC0 10620 bytes
SHA-256: bf1ad79692ef6545926a480d224aacf4f53c6e3e674132bc23113c662d8d6127

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