Malicious PDF — malware analysis report

Static analysis result for SHA-256 585644fe8e22f4ca…

MALICIOUS

PDF

93.8 KB Created: 2021-07-23 23:53:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: e9e4e8218e4bdd53e6604537550bbfbf SHA-1: 79b25f705aed83c4a69402baa3264f60d5fa7f61 SHA-256: 585644fe8e22f4ca82bfe7d156696c83cbafb9f644fa37e39faf87181d6db480
164 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, with numerous URLs pointing to compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of multiple suspicious URLs suggests a multi-stage attack where the PDF serves as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed90d98879---bibugagirurizanozojiwabe.pdf In PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16098f3100a588---16033162749.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/e9db2cd85d814ecb440b3ba4bcc8b9fd/gazapokusalijasozovafebif.pdfIn PDF document text
    • http://55thocscompany.com/clients/62662/File/98386671352.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/66011386743.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/gijidogonopekegajukowejoz.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea2f6ebc09---jixexixesevetunosoxuroxu.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a7c0bf322---17790516564.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/204ad57bae9c18067060f68178eaf92a/pigupekeriwiluz.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/00ad62c9aae36e35680d8b24b34e5690/90224789453.pdfIn PDF document text
    • http://rhondachem.com/d/files/3525958247.pdfIn PDF document text
    • http://russia-ex.com/8878489969.pdfIn PDF document text
    • http://royalgroup.at/tmp/xisera.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/01e911d4eb458fd6df8c34cdb432fe71/fewilover.pdfIn PDF document text
    • http://wedding-ideas.ru/ckfinder/userfiles/files/nukupewixunu.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/63743092011.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/e12a5142159d26c168669ba58bce03f4/zopipirof.pdfIn PDF document text
    • https://lidiyageorgieva.com/ckfinder/userfiles/files/90667215803.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/306876204f66ab493e35db585a855b41/64744527293.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/58094111868.pdfIn PDF document text
    • https://t2sc.me/userfiles/mugezapew.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/532e31ee68e91476e3c3c45aa98cf2fc/nigarovidajede.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=what+is+principle+of+uv+visible+spectroscopyPDF 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_off00010aa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA3 10992 bytes
SHA-256: 14a5d001a6bfaeb6b5d501d33a1a0e1bf6d1d9b13319f85322153c036e4ba5e0
font_01_sfnt_off000123f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F2 17312 bytes
SHA-256: 1cf6f509d66ce661908d882d061ad39e478f76e62a01dfb93ce659d02caadc8a
font_02_sfnt_off00015165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15165 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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