Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0eb2a71f0c86a09…

MALICIOUS

PDF

102.1 KB Created: 2021-08-19 06:08:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 73b1f2d41bdd17712efed03f4fbd3271 SHA-1: df64e0ab0aac0fef3fee62bb5415fa539987b21b SHA-256: b0eb2a71f0c86a09e57fa3c7a42f7bc1c7b781719803420c4ffd8a474b079ad6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this. Although no scripts were explicitly extracted, the PDF structure itself likely contains embedded links or exploits to redirect users to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://infrive.ru/uplcv?utm_term=les+familles+de+mots+cm1+exercices+en+ligne PDF link annotation
    • https://ndmoyun.com/calisma2/files/uploads/52299800475.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/uep5mhbjdn1gn1q456n958bvga/bononozebik.pdfIn PDF document text
    • https://badoza.net/userfiles/file/katekoxuxe.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/29334167178.pdfIn PDF document text
    • https://funbugs.ie/userfiles/file/73092916842.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/501986c4f798edb05e1c58142f147392/tebexezixi.pdfIn PDF document text
    • http://18554080.com/userfiles/file/rojaporixadobis.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/60661693930.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/paxugumojatapigunosu.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/90474572127.pdfIn PDF document text
    • http://euroambulans.pl/userfiles/file/masovazito.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/77583488259.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/64524741379.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/8686cb73463384d5378482fbb563f4b2/tolevujumuj.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b455cda0107---zejefufugelifi.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/72d0d8cb2874e456b81cadb16ead2c2d/64240133757.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160777f3b9f7f2---vezesamamefapuri.pdfIn PDF document text
    • http://finpacecuador.com/userfiles/file/deguzemupazitax.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b88cec3d4e3---60418031606.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160fffacf6b7ec---bipivedugedobikelem.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/duxetonusixo.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096a4df2ef2c---datakamo.pdfIn PDF document text
    • http://clingac.com/d/files/57970390864.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/dcc1ee02dbb0b58383555db4f94b495c/50237045195.pdfIn PDF document text
    • http://igorodstore.ru/files/userfiles/files/12631060158.pdfIn PDF document text
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/9et4fcc2phjjako5b0munm879k/68225363375.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_off00012272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12272 20616 bytes
SHA-256: b080b870d2fe8fd2796dd9045fae25bba0e9eb1623f08eba580c2aa8279b580b
font_01_sfnt_off000156a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156A1 10928 bytes
SHA-256: 1aa2c3ad2b0c0469e13867c28a345a704ee4749c5f95cfc08926f4be9fc02164
font_02_sfnt_off00016fcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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