Malicious PDF — malware analysis report

Static analysis result for SHA-256 d464793f6f67aeb8…

MALICIOUS

PDF

87.5 KB Created: 2021-08-02 15:08:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e397adc9df15af2324ae46bc77c55c6e SHA-1: 9a9055079dfeeb417f9d98a5c11a5e11ec70e2fd SHA-256: d464793f6f67aeb847130d416c8a6eef7d67bb64f41737ade095a749b5287444
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The document functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised WordPress upload directories. This suggests an attempt to distribute malicious content or engage in SEO poisoning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/92247199720.pdf In PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16096284ed9b08---14115905245.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9b44d81d3---jotuno.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/13171687666.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/77448349397.pdfIn PDF document text
    • https://apinero.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720f21a5110---kobaluliw.pdfIn PDF document text
    • http://herve-coiffure.ci/files/tubovusefokekuvuvukodufum.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b590c8d55fd---wokutumenofojipe.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/nrq7lf5ug5lv6b0kqc60rrh0q5/wenubimepolinemibivo.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/67233070123.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d81e79d44---tulomajuzaja.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/20653743037.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/dd8aacaeb6ee78fdffbff75ce4172e7a/sejapomewubebidujivaxezel.pdfIn PDF document text
    • http://gat-asset.com/CKEdit/upload/files/lugelovuz.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/7fdbf51a2df1c019211dfb3fdf9d244d/zabirasisidokatu.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/zimagupavepokugebese.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/foxodurodelaz.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/16b09b530c32620d7cb230dde180dfa0/79625286818.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/lipotis.pdfIn PDF document text
    • http://519pf.com/userfiles/files/pibititogagoxat.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/2325437d27d8a45d591ca5b36d420fab/lowame.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/7816133368.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/40594751962.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+get+flexible+for+karatePDF 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_off0000f1ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EA 16768 bytes
SHA-256: e78c065383a402dda8044f69b98d762baf81e333f691711415684c7fdc7ee59a
font_01_sfnt_off00011d88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D88 10528 bytes
SHA-256: d2c54f52d22f477dcff8252fc034391752261724d063feb3c864c3c0b978aad9
font_02_sfnt_off000135b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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