Malicious PDF — malware analysis report

Static analysis result for SHA-256 daefd77d7021ad62…

MALICIOUS

PDF

71.6 KB Created: 2021-08-08 19:07:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 37e0ef80fc39d38e6eb21babdee8badf SHA-1: 1f534b81e62d27979ca1d59284da6e0357067d2d SHA-256: daefd77d7021ad62ab3c780be8eaeaa48fbcb050207f00f2cb609bde2e0ff2e1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and external URI links. Several links point to compromised WordPress sites or disposable hosting, suggesting a link farm used for redirection. The embedded JavaScript likely facilitates the redirection or further payload delivery, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/33200cce6dc1f16a37eccaa0362f7287/fubusasanebezevoseroluriz.pdf In PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/vaxonegezimivemajepirigo.pdfIn PDF document text
    • http://iziusb.com/userfiles//file/juxatamozanifus.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/q9dn7m6il6vtkmgpgfsauru4d3/tudew.pdfIn PDF document text
    • http://asfalon.com/__files/file/86164970251.pdfIn PDF document text
    • http://earthtalismanjewelry.com/clients/b/b2/b27d4d76c51cd35ccef873a204118430/File/5156429240.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/dariwikemize.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/miwapa.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee6035d62e---59185628198.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/zetumupifavezarenafovelep.pdfIn PDF document text
    • https://gullyracing.it/admin/ckfinder/userfiles/files/19459808826.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0534660001620986088.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/78347500302.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f56bbb11c2e679c1cd15ef8fec2bc6ad/19909390200.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/tsq6sck00acgom52vv43s39abi/94827571874.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/2a2a52a23f59bc4545c892e9bc94a262/mebulexazine.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/7944906189.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/960f84d5df2e5cb456a7bb2ab3d28089/majikapujifeju.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160888daf93d29---gedidixumajoxotumid.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/wuvuxotofefar.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/domiwovulefixakiwetogukev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=harry+potter+fanfiction+hermione+meets+the+maraudersPDF 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_off0000b4da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4DA 11044 bytes
SHA-256: 8d7c46cb6bb4965cc2db72ee855e2c05c28ba02645d06e0a23e8f0199888eb93
font_01_sfnt_off0000ce60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE672 16436 bytes
SHA-256: 0863b8e5fb634464062b09f0d9ee0dd147ef778e7eb58fedfbcdc3d4ec71a755

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