Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf8f419f8d3ccd5e…

MALICIOUS

PDF

95.3 KB Created: 2021-08-09 09:16:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: af190f7b16eeca65426e9eced1357af3 SHA-1: d6f0837367cc62e045736bbcca31f12fba75c996 SHA-256: bf8f419f8d3ccd5ee66be1814b2251345c8bf2deb942dec0dfab65f391c7ec86
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to external sites, many of which are hosted on compromised WordPress installations, suggesting a phishing or malware distribution campaign. The presence of urgency and invoice lures further supports this. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://smidgel.ru/uplcv?utm_term=lg+tv+43+inch+price+in+india+amazon
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607037ff1088d---telezufagilig.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160be5b89856d2---15984957640.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf3bf60ded---dawiserazilewif.pdf
    • https://taipeitccia.org/CKEdit/upload/files/vokilomaxoluf.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c092478386b---75348791583.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b31b04aa8---sukadiwedavujise.pdf
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160814054b34dc---74417606162.pdf
    • http://afgventuregroup.com/cfiles/file/81583825416.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078782fcfc02---dilusunuzek.pdf
    • http://baove24h.org/upload/files/74666162804.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/a8c97c93f5ba1f3718ea6040b35359b8/letedexikebeb.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed55452260b---93023345231.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609dcedc49614---vuvurivewazaja.pdf
    • http://arcenevents.nl/site/upload/files/74500902400.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d62aefe89---84406800095.pdf
    • http://beijingxinzhi.com/userfiles/file/20210703094251_933102968.pdf
    • http://micronforgacsolo.hu/UserFiles/file/49376781951.pdf
    • http://tatennis.ca/clients/29257/File/710657629.pdf
    • http://absolutelyneon.com/userfiles/file/xegerawuvudumipivese.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/50003d8d36f07597705b6f0d0030ba96/vifewalorabumarebajili.pdf
    • http://vanhacollection.com/images/files/zeweluboxalum.pdf
    • http://epoxidice.ro/mm/file/47367814653.pdf
    • https://pestresolution.pt/site/upload/file/tixat.pdf
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/baf7bf5666e2ecaad559e885cce35aec/jaselego.pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6ef.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EF 16792 bytes
font_01_sfnt_off00010f01.bin
bf401e4b0f13228f61ce6128edf82e031431bae394aca2e76d22994c8906b560		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F01 17344 bytes
font_02_sfnt_off00013c7e.bin
8b047a624801a7d5a7423436243216bde6a6e5319fe9c499be771fc79b7a61a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13C7E 16756 bytes
font_03_sfnt_off0001539d.bin
5f2ee607d09a6da8df3983163271e5fe5ce36bfec8e0787a26c3627ed68b956e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1539D 11080 bytes

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