Malicious PDF — malware analysis report

Static analysis result for SHA-256 746c246d56d514b3…

MALICIOUS

PDF

91.5 KB Created: 2021-07-18 14:57:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8bc0d96a5054c0cdb8571c9d7140a17f SHA-1: d645bc48d250e95406f81791bf17576eccf3e236 SHA-256: 746c246d56d514b306abf64686788c9b72e5c72e82715de6ce6f2b689d8e5225
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and ML classifiers indicated maliciousness. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085ff3b19e3c---3057236488.pdf In PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da3c4c5a01b---86980108969.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/0v0m47b9oh8ioni7io1f37on74/46036743476.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082389d2e503---18938917016.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/91624968406.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/723243829.pdfIn PDF document text
    • https://brod-plovdiv.com/images/14615564027.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607602e8104d4---vorep.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/s18evuuk14vor2p78pbriievcm/21323798250.pdfIn PDF document text
    • https://ntc-container.com/upload/files/51416351759.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/m7gk4cgkvmjnd2t9ahhkj37ui0/vamutokidujidimirojusika.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083fe2dd63b5---ragat.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e875f20418---tosovugulevikazon.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ed9f0beb51b---vozidulakut.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/xutawarotavafu.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/62980906510.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/14a572126d44255a01711233abb0af26/62287362599.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609caefb51216---64632807800.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608589d59ee8f---34815236475.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/nenosokovutesunu.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/11798404399.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/ribekuxuxufi.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/cd6jpji86pn8chg67cnfllf7h4/tibupigimageromodevom.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0b774bd19---maduxadu.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160905e880b238---gebatixazilurejufu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=get+files+from+phone+with+broken+screenPDF 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_off0001025f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025F 17292 bytes
SHA-256: a3a9b4bd949e826c0114177c6f9920741f8b00f7bd059d0726c96d88fe91a704
font_01_sfnt_off00012f6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F6D 10940 bytes
SHA-256: ca2a04e6aec896ffc6d5c870d8587f0a9358c2191c96d0804dda31483eb44e16
font_02_sfnt_off00014873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14873 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1