Malicious PDF — malware analysis report

Static analysis result for SHA-256 78040129e8298246…

MALICIOUS

PDF

73.8 KB Created: 2021-09-02 15:45:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3ddc89487f13229efbb4454e03c98173 SHA-1: 6672c05b90de90f30284d1878f11520be7e9357e SHA-256: 78040129e8298246d56146c07283a5385709bde21ddac7aeef38e90f26acde1e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and disposable hosting. These links likely serve as a lure to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://medvor.ru/uplcv?utm_term=printable+handwriting+lined+paper+pdf PDF link annotation
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/ff54p0ad8si2f4h0r55cc89nb2/kozadu.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/25766bea534faa2ccf1dd0973c561be0/85361784853.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c87097500c4---juzirozesonuv.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/rowinokevobifoboz.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104fd4d220c3---57669343805.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/33309214989.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/mekewuburuwetuv.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121a6c2c8017---bonebifeguzoparawu.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/0e2f3fca43fa5df7592b0df845985606/15645257334.pdfIn PDF document text
    • http://rayanchem.com/d/files/juvogosesag.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/e2u3oi3938e74mo7663plp6fab/siwufitepa.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/a090e6f1dc3679172b23cfb501efaa05/giremorug.pdfIn PDF document text
    • https://danielfelber.ch/userfiles/file/tatexojazife.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/mimenutenivi.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/dulisagogogugiwefavox.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160befac144b8f---39239042198.pdfIn PDF document text
    • http://www.alcera.ca/userfiles/file/foguwu.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/24490541351.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/gigopizon.pdfIn PDF document text
    • http://janatalnajaf.com/basefile/janatalnajafcom/files/64542486158.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/nariperusetipewagujas.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_off0000bd7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD7F 10716 bytes
SHA-256: b1a2bbafaaeacb4397186d9c641c1f7cb14ccd6b97b1716cf9238d990c4fd372
font_01_sfnt_off0000d59c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD59C 17208 bytes
SHA-256: eee3e2882640f4dda7ef211506622ff6627bd4c4e109737277c3dbe77bee7622
font_02_sfnt_off000101f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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