Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2e764bab28494b0…

MALICIOUS

PDF

111.3 KB Created: 2021-10-10 09:07:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 70a42553270098b7044ab021ee1c9b24 SHA-1: 4ebe1aba5ff46f58efef1fe488de86a894ba27ff SHA-256: b2e764bab28494b0a69a32ca914c0343f3cc682b185db8ab88a12c0048cb10c6
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, with several URLs pointing to compromised WordPress sites. The ML classifier and ClamAV also identified it as malicious, specifically a phishing trojan. The document's structure and embedded links suggest an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 https://kstraders.com/userfiles/file/pagawowuki.pdf In PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16159c7d61020e---fanorejori.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/3957eb7a76b41dc271137a06165e3c43/30853700438.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613956b15da23---vazolud.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8bfcb759a---32316855975.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/wibedibujiketotalosaz.pdfIn PDF document text
    • https://peoplehelppeople.net/uploads/File/45645640799.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/25194244100.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/6175632621.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/samezemepixoxerefajumefo.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/31026872547.pdfIn PDF document text
    • https://euro-m.si/web/dokumenti/file/vivuguzopuwizapuvexix.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16145f0616d3cc---nagivor.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/lodubum.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/74730860401.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/73249477555.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/suxabivuvojaz.pdfIn PDF document text
    • https://h16hr15k-h19hr37urn.com/contents/files/85501364358.pdfIn PDF document text
    • http://quimicahj.com/admin/userfiles/userfiles/file/96214320619.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/jorilodijakijerasepute.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/93828261610.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=jacob+son+of+isaacPDF 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_off00014820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14820 10084 bytes
SHA-256: 278ac612f3657290bcec84183c753a848812ee3255872590306a7018d2e8aef6
font_01_sfnt_off00015eb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EB6 22424 bytes
SHA-256: 819635ebdb71e5ddb15abf298264cc6ae0fdb9517d56dcbd4fbec8d6f17a445e
font_02_sfnt_off000197b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x197B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1