Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7ecf126d53e60df…

MALICIOUS

PDF

97.3 KB Created: 2021-06-27 02:10:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a7e12d05a9890b81758f9a1f183f9885 SHA-1: 4fbdc94554963bdb40cf4f19d510496853c1345d SHA-256: a7ecf126d53e60dfda96450f10d07aa51215391c3483ea3dee2096500f24dd99
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories or are hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The document body is unreadable, but the heuristic firings strongly suggest a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://agiteam.org/clients/b/b0/b0c4817036ef1cb73596cc935f3fa86d/File/jimaludubobubipa.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d582ec6506---muviwizidiwevorizag.pdf
    • http://zimaletto.com/uploads/file/69636681251.pdf
    • http://qytbearing.com/upfile/file/pememibizi.pdf
    • http://novussiteyonetimi.com/uploads/file/levuxaledaraveru.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/c4fc7d7cb98cc535c3aa582187e7e632/52369889562.pdf
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/8a2edcd43f16b2af9f646e423bbef9b1/pafarijazanigumidozamijeg.pdf
    • http://mamnonlittlesun.com/upload/files/wezulogaloselokikapud.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c9a2121d4---43636209739.pdf
    • http://bogelaipigeon.com/upload/file/29114844171.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160768dfd18713---56970028013.pdf
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b24eb478d---dizoxujubamulaxuvonemigo.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/ci14ion07v48ba20fu2hpdmhae/womiseramijibalimorixoxi.pdf
    • http://myexamadvisor.com/fck_uploads/files/semadenatonemaxodod.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16074acc352bca---kudevobapezezapo.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a36ffe487d0---37333411119.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b2d891d89---lizabokigokegasezunejufi.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/8jolcuvr2gia8lmsl4kol3f8n8/35018390653.pdf
    • http://www.pics4us.de/userfiles/file/21295364344.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a2f1427d6---21882917096.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1609404292148b---zekivebanufozesulasujese.pdf
    • https://www.tunnel.de/files/uploaded/file/jamozizizimakofimifow.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075662a479bb---lumazavuromutevopina.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/6f49c16bcbd48216be4df0369f9b5410/70717574277.pdf
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/megupafidewinitaru.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=is+tuna+good+for+upset+stomach
    • 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_off00011c66.bin
dc427cca9a1c23d78f7be51196cb2edeac8456ea9aa6a4d94b6e6d62633abf4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C66 16368 bytes
font_01_sfnt_off000146e3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x146E3 16792 bytes
font_02_sfnt_off00015efa.bin
b0d7522e1ceb31cddee394429f2ccbb865737e6b8bc828d80a5692fca0f15c98		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15EFA 10980 bytes

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