Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab4f993ed54c9d09…

MALICIOUS

PDF

88.1 KB Created: 2021-08-13 19:53:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 636104a76694e22e53cfd4df26dc3918 SHA-1: 9428634f41778cee604a388988b202462ffeb297 SHA-256: ab4f993ed54c9d099a7b7c99ac40ed54e7109eb89203bea2cbe32181a8beab15
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to numerous distinct hosts, many of which are hosted on compromised WordPress sites or disposable domains. The embedded URLs are likely used to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • 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.
  • 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://zoncmswebsitebeheer.nl/files/editor/file/nawutezelerajuxun.pdf
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/q8kpl2b9jaq5m8ipo7kvsund9l/84625832966.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1608197ffe260c---dapijemovam.pdf
    • http://alphanaturehk.com/userfiles/file/29317854682.pdf
    • http://galantemontagnana.it/ckfinder/userfiles/files/gowarolofuzijiwa.pdf
    • http://nedirajtebosnu.net/userfiles/file/zusulidapotufasusezi.pdf
    • http://ketoanantamhcm.com/uploads/files/42924244369.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/fmfn2tsa57r6n7eklu3kpv9v43/jurafimolikinofo.pdf
    • https://kimtuong.vn/isc/public/files/fckupload/file/livinutonawuwituwaragidoj.pdf
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/539c2ef2bf9a0551f1ddad760296c5a6/39973717705.pdf
    • http://robalton.es/Albums/images/file///79917485492.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b63a54aff44---pijurenoxefigepumuz.pdf
    • http://zuche0551.com/upload/file/darivuke.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160886e6f46791---jogevoge.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1610d79dbe52ce---gavoliniketes.pdf
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/9e26a821f09c3c3059b9e1910bf2bce2/43599642945.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/72e4ce3080ad3404e39f2a19bfa63ee6/domajobovegekifimajoxomo.pdf
    • https://advantagelic.com/singhania/downloads/file/moxurasodixumuduludi.pdf
    • http://minerva-collection.net/files/files/85059402960.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854b142b13f---zonorixunofapuvumibowug.pdf
    • http://uss100.com/clients/5/56/562308f4da1da23328cfd9e5c9f3e68f/File/wopubutesujaxebite.pdf
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/60a3892e1479c0a165fd406a8f9e955c/solojokujelobabe.pdf
    • https://aslimitada.com/userfiles/file/99167048514.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=learning+styles+of+students+in+online+classes
    • 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_off0000f4c4.bin
78ec000c2d9f662cfd86712b8c53369f2f8f5519b143f83716f5bc1ead40c636
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C4 10824 bytes
font_01_sfnt_off00010dab.bin
293da00e9493c71bc1b96985b8259585bf02593cbc6d2e1167d018281f62f070
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAB 16940 bytes
font_02_sfnt_off000139ab.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x139AB 16792 bytes