Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6b378417d99712f…

MALICIOUS

PDF

142.6 KB Created: 2021-07-02 15:56:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 14f6fb38472bbd6ca9da96e2790297ca SHA-1: fd3b28693dd7650f0e905a5f869979fc90736979 SHA-256: d6b378417d99712f8e935f3f5d4543e5e082669fd031182fb95d97c28e6fb7c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised WordPress sites, suggesting an attempt to manipulate search engine results or redirect users to malicious content. No scripts were extracted, and the document body was unreadable binary data, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/nro4vbmf790oki129egcvtamc3/87115656134.pdf In PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/76804f608873c0af81ece2f1a37e6372/kepiw.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/0ef5dd74bd0cc446990f827307c3d603/20604370025.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/bc583227192fe7a4444a26830a99bd0c/23243362993.pdfIn PDF document text
    • http://iphysiology.ru/upload/72144354561.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/a6265d175a163c938bb75afc09f6e115/pezamala.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0704629b83---zinenapakovi.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160cb3216d0449---54259001774.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/896b704e249de618568347e5384e4aa9/48318687663.pdfIn PDF document text
    • https://kham.vn/userfiles/file/wilameguw.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/golitiponuka.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/113ba45d5c06d77dd94c524027fbe4af/46613604243.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/wisinotajawikugonezap.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c76e911311a---buvewirix.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/a040c5bc3dfc10d5b6e118176190b675/pevigi.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/wanamelenifixup.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7b61b05ff---pusudukagolekejigafef.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/593b5af3ee0b26aa98c04b492d4a13d5/kinori.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/dujurupufugezebagaba.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/0fa112c744443f50809f63ee340c3a11/614321847.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/b1c930ff6c5c679abe55a591fc0e1072/rugifo.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/gjkfu55q4dta5gj4udc00qubk0/24983840215.pdfIn PDF document text
    • http://sanzmendia.com/userfiles/files/17222537189.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/razevufovinibezifitexute.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=the+short+happy+life+of+francisPDF 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_off0001cc78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CC78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001e48f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E48F 10652 bytes
SHA-256: 4cd773283dfd900d6d237e26fb5b7b4c5d65e8eedb5cac1865d83c41954dfbdd
font_02_sfnt_off0001fcf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FCF5 17724 bytes
SHA-256: ea27fab76e0778dd913128ac96dd2271ea188ca32381243b9f85cbc61d0cfe19

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