Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7485dc3f2ef024f…

MALICIOUS

PDF

83.0 KB Created: 2021-08-30 12:59:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4d7aa76448a654911a3d8302316a2a7a SHA-1: e544332de49dd766b8daecde95bd2fde7dfb98b2 SHA-256: f7485dc3f2ef024f79fc1a352d3fd117424c186b3a681cb8a44ca0d9e59ee0f2
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous links to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The 'SE_CLICKFIX' heuristic indicates social engineering tactics to trick users into executing commands, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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=how+to+disable+auto+restart+in+windows+10 PDF link annotation
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/d88n8hsdeeo4qpm1ba815pbqdp/43491088434.pdfIn PDF document text
    • http://www.pibmg.com.br/ckfinder/userfiles/files/files/kubana.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/46828266796.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acffd6efe48---gikuzadexumijizibosaj.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/nizoju.pdfIn PDF document text
    • http://salespate.com/userfiles/file/xufodulemuzab.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/kovanerobeluwosara.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/9f78e8a6b8699a353ff367d00e3ce2f1/sozumovogezuvuri.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/a1829b79a506f64777f59ea61426863e/52685975794.pdfIn PDF document text
    • https://www.dgaspcsm.ro/ckfinder/userfiles/files/tizuzutanaliji.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/keponal.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/gepegoniladanemud.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/mveluvielbubtdrgl4oivekqk2/57331706263.pdfIn PDF document text
    • https://equinox-e.com/upload/files/29447057200.pdfIn PDF document text
    • https://caror.hu/ckfinder/userfiles/files/17989342855.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16089e37d0a74a---vepavakarusivuvanibomiwas.pdfIn PDF document text
    • https://elemental-ia.com/userfiles/file/99069306234.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/af6f8e557c264eed59216312526d24ba/24575829966.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1271e9aac6---nevobimurodanituzowite.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/a862d43e2d721cefafd8e5850d770e50/21485523625.pdfIn PDF document text
    • https://businesslife.com/content/file/80079892444.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cb9d466f3f9---gaxarolotamoxuvafuvobusu.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/7451384973.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_off0000dc33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC33 10732 bytes
SHA-256: 6be77f5bb0e18163375cb989c1f847a4d3d03f86ce9610094dc413c98ebdbb1d
font_01_sfnt_off0000f4fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FE 18264 bytes
SHA-256: 6975e32a8bf3a89f2e2dbea0e4455642ef7cb99b0d55322937cb0551d3f2cc88
font_02_sfnt_off000124fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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