Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad4e8c9ac9d29862…

MALICIOUS

PDF

87.3 KB Created: 2021-07-02 15:50:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bfb5617a9ad0ce1dacd6373d88229c04 SHA-1: 2c3ffda742b99c02486b5f8cc17a550c5f047d84 SHA-256: ad4e8c9ac9d2986287843c40d958dc8a1690192cf051c30e07b6b568fda315bb
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, with numerous embedded URLs pointing to compromised WordPress sites, suggesting an attempt to distribute phishing content or further malware. The presence of these links and the nature of the hosting indicate a tactic to obscure the ultimate destination and leverage potentially compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/c9e63b8fc8cfec1dfe789c86ccd8dba2/bipif.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/up9j5497oqjg17gva5itr25190/tapanus.pdf
    • http://atdawnwelift.com/userfiles/file/pabamenamimokisedoxus.pdf
    • http://fratellilongoni.com/userfiles/files/32399194886.pdf
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/be9f9d606022c58c6413a6e69bdd651e/pupikinisot.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607c0c05e3d44---rusinimopisiserodofapire.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160910910371a5---66558902376.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16084b1bb4baba---bolavonusifikejaxixarav.pdf
    • https://shopabrang.com/images/files/fufovusuretir.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9d6c9a13c---vaguxubitirumoxib.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6d17bc610---tixakebikebe.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/e20d323cbfd4a4a3ba48de325521def8/78147852716.pdf
    • http://hydrem.ru/images/file/78591650220.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/b2tf5v50ge7b54crff1el0tfj5/zifasogizop.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/b01edd0a2f2c0e672c3465c423714191/3523079795.pdf
    • https://guapa2.com/admin/fck/file/18073020122.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3425631af3---46757887203.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b2f4eaffe---66500242416.pdf
    • https://daismene.it/file/vamasepizufexuzo.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/526513278c4176d80f8f9630e06a4478/gebosefugitomupepev.pdf
    • http://ksnjl.com/userfiles/files/topulitogeroluniwakavefo.pdf
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/p74cs1bk8e30nc895hpu8lrib5/32614491335.pdf
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4dabaa9ee---sozodiz.pdf
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160809283da080---4760084036.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=love+me+with+all+of+my+heart
    • 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_off0000f27e.bin
7da566891210c4f316df617308e6dae9dd2c1f77218ac4a8418a0ac321906c91
pdf-font-stream PDF embedded font (sfnt) at offset 0xF27E 17580 bytes
font_01_sfnt_off00012055.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12055 16792 bytes
font_02_sfnt_off0001386c.bin
b7b2d803775f9d95017c1bd471c28b31f007e7c180bbd0ff3e0f7a37ef409eac
pdf-font-stream PDF embedded font (sfnt) at offset 0x1386C 10432 bytes