Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddbf43b68efc9056…

MALICIOUS

PDF

69.9 KB Created: 2021-09-05 11:57:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 65e0ec0cbac904f7490ea234ab55475b SHA-1: 2b0db73785532deef80a0fbc4483da3796edbf94 SHA-256: ddbf43b68efc9056cbc04f01cc54151cdaea1bf8ad6edb9fa2441732c4a3ee8d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded links are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://homeopathyhongkong.org/files/2849501739.pdf In PDF document text
    • http://ulv-fogger.ru/d/files/61667867776.pdfIn PDF document text
    • http://schule.havonix.com/ckfinder/userfiles/files/45031138294.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/mrpmhrj6g6pklu739rfh63ke07/65099332330.pdfIn PDF document text
    • http://jkphotocon.org/data/userfiles/files/24947869550.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160c167fb4d1d3---16501006806.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/v8mp23lr39vjaq9emv8jboflj7/83902193948.pdfIn PDF document text
    • http://vodova51-53.cz/files/mivelomurobe.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/94333049968.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16076a639b47ad---92578475971.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/67530999973.pdfIn PDF document text
    • http://janandpoos.com/clients/872640/File/85764196662.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608d69fe8ed05---34633818310.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/50rvnlq3mpip2hvn7hpuntfnq0/41099905428.pdfIn PDF document text
    • http://nlureunion.com/clients/33063/File/kowumujejesebedarijule.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1611a901bb9545---39250899151.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/721d13df239e587c938f48a989850c2c/7415289482.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16133b6e4ded6f---65563834145.pdfIn PDF document text
    • https://actor-conseil.com/files/file/wajirakabalo.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/36695472615.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/dp2g4p1men8jos4nsl9j14aqo6/jilagagolemaf.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/4e62d484122760418905217a1e22dad8/gidulalat.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/9d88a79846c0c0b49c59b83037a2f125/33828406946.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/30223880709.pdfIn PDF document text
    • http://askort.pl/Upload/file/91573935429.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=non+tariff+barriers+in+international+trade+pdfPDF 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_off0000b56b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB56B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD82 10608 bytes
SHA-256: 9bc575fedee2474105499dd11702e1d943b5affc7bb278965130cd054a3ce3fe
font_02_sfnt_off0000e59f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59F 14356 bytes
SHA-256: 44481ee7e3c97d8e29715846b04d22ea98549d57f7cf78feea7e9ead45a5528e