Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6f762905f7b8fef…

MALICIOUS

PDF

79.2 KB Created: 2021-06-25 18:57:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 067b1099ab26293783e4f0b2d195d9f8 SHA-1: 597b97796dc4756ca118adcc33680c2957c45cca SHA-256: b6f762905f7b8fef70cfea965a6ff06bf2fceb214865288edb531d5e905929e3
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites and other disposable hosting, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded URLs and the PDF structure itself are evidence of this malicious link farm behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://faradbox.pl/files/file/57820035835.pdf
    • http://abpaluso.com/upload/file/7066327300.pdf
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/81e8ed16dfb971a3cf727da88c836be0/xizezo.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609281cf38a73---6908842467.pdf
    • http://myjacksonfamilyreunion.com/clients/e/e2/e2167ce47089e9b789d53270b7cccc99/File/ridepixabifunor.pdf
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/640eb4ddb21b535192d4bbc7f76af169/12721691141.pdf
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/327242eeffe11578f8817ed6695f9e8d/52685475598.pdf
    • http://diclenakliyat.com/userfiles/file/18933767691.pdf
    • http://studiomarazzi.eu/userfiles/files/gevulimivupufirunelikigud.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbe3a0f92e---xovezinunulul.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbd2a057ed---vamimawizofudewuvaz.pdf
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/61405768266be3a7ee806121f82073e6/bejimanojuzi.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c289f637eed---gikofoga.pdf
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tizukewetirigosegefazadew.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbaaa1ee2c---semebiditirom.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094691907e1a---46103355976.pdf
    • http://mp-hd.de/data/aktualnosci_imgs/file/77487057726.pdf
    • http://amctop.com/board_data/editor_img/file/202105250707.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16077f80981379---wurijipijipo.pdf
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/wepezuwenijumarefez.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/8fa06b59c5f59ac86ef8755bc5b7cd1e/tawokibikoxuwalunezaxivo.pdf
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/0gnmssfpldcrrlde5ulle29p46/32980523061.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/gbgd8drjje6lucblhaglpspg6g/38701062064.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=matching+colour+of+purple
    • 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_off0000d526.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD526 16792 bytes
font_01_sfnt_off0000ed38.bin
3f14701f4ae9a49dfd81eb0f7ca9d7fc5e1ff45576f13871d4c6f04f39ed76c3
pdf-font-stream PDF embedded font (sfnt) at offset 0xED38 16372 bytes
font_02_sfnt_off00011762.bin
88e3241eb789dc527b191c432ecf0c70638c3af3f33996501a62385d2b719fb9
pdf-font-stream PDF embedded font (sfnt) at offset 0x11762 10684 bytes