Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a874597498f9af2…

MALICIOUS

PDF

84.6 KB Created: 2021-09-03 01:49:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cf5c6e654dc2273e7f680cd422bf3807 SHA-1: 777025edab2c3e470e8a4b7f1f531fbfd469606e SHA-256: 0a874597498f9af2be6d764ce72b16ecd99246cf0a9b42ac2ff808ff5efec048
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF that exhibits characteristics of a phishing lure, specifically an invoice or payment scam, as indicated by the 'SE_INVOICE_LURE' and 'SE_CALLBACK_LURE' heuristics. It contains a link farm pointing to multiple PDFs hosted on compromised websites, suggesting an attempt to distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://restavratorstvo.com/ckfinder/userfiles/files/wemevofesidox.pdf In PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/65788586901.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/f90761b305b6f536b1918289dfd85e71/somagi.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160819a8ac400d---57632111378.pdfIn PDF document text
    • http://dlt-nkp.com/fileupload//file/50520712433.pdfIn PDF document text
    • http://ozkayalarlojistik.com/userfiles/file/ritisepunewipen.pdfIn PDF document text
    • http://hncastlecable.com/d/files/mubusuputikosubinu.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f428333010---gitixixij.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa945a30e64---vinugogesadi.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/fodivonav.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/72d0d8cb2874e456b81cadb16ead2c2d/64240133757.pdfIn PDF document text
    • http://teleinwestor.pl/userfiles/file/85640163198.pdfIn PDF document text
    • http://springgalleryng.com/Images_upload/files/dunirewozagel.pdfIn PDF document text
    • http://jjsgreatescape.com/uploaded_files/userfiles/files/38339822570.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/tinozekaridefowigogapox.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/42154493900.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/3956b3c2854ac62bd1eedd669eedaca4/92488861295.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/liminosedixudoz.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/ba3c906bf73792baac97a4637b1163d0/debakuxuzenezonog.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/16115923938.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/161151f98b7157---81245559001.pdfIn PDF document text
    • http://hkt-optics.com/hkt/images/userfiles/file/71543199777.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/edb02a95e9eaaa2733355fd54e50579c/25893185566.pdfIn PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/97381080692.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=fcra+act+amendment+2018+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_off0000e341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE341 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB58 10832 bytes
SHA-256: f3b58d695fc2a6c3824800cb645dfc63cec8a13629a46ae9ca0599a31e80a043
font_02_sfnt_off0001146f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1146F 18536 bytes
SHA-256: 1cfc5e4a17d9123db5dd2c376922d4bb48b825a0e690c7637d36ac510820a9dc