Malicious PDF — malware analysis report

Static analysis result for SHA-256 db58576f142ea62a…

MALICIOUS

PDF

87.7 KB Created: 2021-07-06 23:00:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e08a09fce4d885c3825c624d9fbd07b5 SHA-1: d9f5cd9715a4e6769afe1f1ce694b07d48392e74 SHA-256: db58576f142ea62afd260c43546916784d4b8cd5889716cf5ee040524df9fb28
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains a link farm pointing to numerous compromised WordPress sites and disposable hosting domains. These links likely serve as redirects to phishing pages or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 https://coretry.ru/uplcv?utm_term=mosfet+fabrication+process+steps+pdf PDF link annotation
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/7af8b9a22e34d49cda2d8d440032a3af/60551645271.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074be8ece86f---99353175596.pdfIn PDF document text
    • http://slesnick.net/userfiles/files/lemulenemanuvij.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/xagububepivagi.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb9fa29630---ramibilizij.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/60c5f3877c61a3da0d47e5c33a2e32e3/92451319424.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/3f053473eb648434f442c5c4c095c8f3/18862520301.pdfIn PDF document text
    • https://digireg.ch/upload/73002266986.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/37349516985.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608641bd9c0ed---laxoxosutonawop.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/oh64mc774rt3pj8vp3662r71r4/bitegipuxodujatewijinav.pdfIn PDF document text
    • https://zold-kommando.hu/files/sexamowekilig.pdfIn PDF document text
    • http://dlt-nkp.com/fileupload//file/31181205254.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/62461409259.pdfIn PDF document text
    • https://standardpromotion.com/images/upload/userfiles/files/42274486017.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5bf23236c---desagerovov.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab97eb3743---vidugulotijeginurofo.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/j8fsnvndv7dvsel9rhuoru2e0q/danakatoruronuvi.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/wefazoxaziwoliro.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f2b6a8218---18782933748.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160909a3360de1---70751713164.pdfIn PDF document text
    • 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_off0000f601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF601 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E13 16492 bytes
SHA-256: fe7464d6c191cea38200e448affa0c4715c33888890d359047873596f5cd5c96
font_02_sfnt_off00013913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13913 10700 bytes
SHA-256: 01acd50275b5e29331dfddcbf2809d5b1ae311e49d8e1151721ea279d40368e8

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