Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cfe0b5e3941bf72…

MALICIOUS

PDF

75.9 KB Created: 2021-06-26 04:03:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 58fc3118ab207fb04a922c7c9f7794a7 SHA-1: 708572e4cfbc9fe0aceb5a42f744126292b69c58 SHA-256: 1cfe0b5e3941bf72136483ab72640f11b9e4d3a2b70cf0e611261214a708a75c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites, likely serving as a distribution point for further malicious content or phishing attempts. The presence of embedded URLs and the structure of the PDF suggest it is intended to lure users into clicking these links, potentially leading to malware downloads or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/1d3e92283dbb98024b667301b7a2d015/84222042079.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607617397925c---3249995271.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a36b71b48c---13905387458.pdf
    • http://analogsys.com/uploaded/file/51782381760a8a8da11190.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/aoq0lkrug5cfstu0241spa8hu0/fofefosejixikid.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717df823c52---jepafobififimewapivuvasa.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078323beaf89---86618396327.pdf
    • https://mttrasportisrl.it/dati/upload/file/tawifegujunokedavete.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/5d03c918f5164b5c5825444a6998c63f/93819202532.pdf
    • https://autoteam.in/ckfinder/userfiles/files/kagavozum.pdf
    • http://baraanduliaptti.org/userfiles/file/55645231392.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607238b598ca9---lowunitamubizidofepujuna.pdf
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/c8964280f05cbdb797234f60bec8e026/xobojaxebexokibin.pdf
    • https://loctra.net/userfiles/file/jumujidem.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160815cbc46148---fokawekunejikejiro.pdf
    • http://brandnewgoods.net/userfiles/file/pexogowezok.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/tkgg9f7e75mi9iss4qoaii49vv/fovufof.pdf
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160834a81e7e0d---89182141048.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16071f64b19b61---bipezalol.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608b17222f27d---74599859003.pdf
    • http://albatrossmrn.com/konadnew/userfiles/file/47047355676.pdf
    • https://argekaucuk.com/nbg/upload/files/1245841563.pdf
    • http://tcsm62.org/uploads/news/file/xarufekanopanizowusov.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=the+spy+who+loved+me+123movies
    • 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_off0000c385.bin
e92e85c96a8ba7791a76bb3e7dc88a55fee92bfd59e7963ba7c628969020d1f4
pdf-font-stream PDF embedded font (sfnt) at offset 0xC385 10768 bytes
font_01_sfnt_off0000dc74.bin
0170379ffc4974dafa09fb2ac4edf8f87ed403ea39e8df5c4a3a558017a16951
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC74 17512 bytes
font_02_sfnt_off00010a6a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6A 16792 bytes