Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ef6d9f4f589034a…

MALICIOUS

PDF

92.0 KB Created: 2021-06-29 07:41:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 54b4da21f11daca7a2e6b0540a5401fc SHA-1: 1f736ea7228d44b5fea2fe9ae00df6df06990d54 SHA-256: 3ef6d9f4f589034a698ec3a6756b7a60a3a837eee6b69c6fa7d420f4e25c097e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a phishing lure, employing a link farm hosted on compromised WordPress sites to redirect users. The presence of multiple external URIs and the ML classifier's high confidence score indicate a malicious intent to trick users into downloading potentially harmful files. The ClamAV detection further solidifies its classification as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://oniceh.ru/uplcv?utm_term=word+document+to+pdf+file+converter PDF link annotation
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606da0a1c288b---22599284269.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/ce18f35641ed2617ebe1ff4daaa56cb9/27469971482.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/49bp7p7fcg4ksui0j73oouipbu/69436596591.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc18f4a45d---gumopalunoge.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/pirolekoge.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/51903601719.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/15421844595.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/cfokq9ld9m51h15t0db2k1haer/wudule.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3b19fbd03d---muroxaranijavubuzotopesiw.pdfIn PDF document text
    • http://interstyle.org/content/xuploadimages/file/wimidolomobepojojuganaxe.pdfIn PDF document text
    • https://renault-service.com/userfiles/45949041884.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a8bf4753c---62319443271.pdfIn PDF document text
    • http://euro-ex.com/images/blog//file/81273819386.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607989ccdb749---gisixaw.pdfIn PDF document text
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb472ca33c---toxipefesegerulukopuse.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/85544310d76b62feb4a06f6b258e4f61/romudibufakabi.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16082bbacd0461---wodulojedakusov.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/80rj5t6e6h0dj7a40210j96kbi/nalobuwuxuxemusepage.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbb5f51fc3---xazuzawozogetikavefaja.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/sosazepujologazukoso.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/60897393676.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160996d5242ff1---38151745501.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9c73eb310---somudisuwuk.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1E 17436 bytes
SHA-256: 86282252677d86627fd52264a6c908b8d4813f7ffe663f03b13394d76aad7eb5
font_01_sfnt_off00011c6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13484 10608 bytes
SHA-256: 730154c704499dde00e3daf3b197ec201d15ac431789fd4a976c11530c8525d4
font_03_sfnt_off00014cb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CB4 16144 bytes
SHA-256: fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516

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