Malicious PDF — malware analysis report

Static analysis result for SHA-256 44bf007131565bee…

MALICIOUS

PDF

83.0 KB Created: 2021-06-29 11:05:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 79d3b40ec74102d58a55c103faf6aee6 SHA-1: 93eed2bb34f2bd466a284b704df110444de89067 SHA-256: 44bf007131565bee86ad5195064e5816ffe60e4d1f8c4fc861407caf4d46db0e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://mides.vn/images/ckeditor/files/wasinejoginozifinezif.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608633fbc6e6f---faxaneruvinofagukanamosil.pdf
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/5b16e062dd71e49200df8315c23e0bdf/33335166071.pdf
    • http://agcslohian.com/userfiles/file/88229655034.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984583ca5a6---vosexurifikada.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608e709336aa3---27464632325.pdf
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/jk5g86ikglict8c67djt52bc89/folekafavededinagar.pdf
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/8986926f26f95a33b681e4fd8ef63643/retaj.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/drlbeb1b9hb1tt8eh15kkvc3v3/namifujikas.pdf
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/v4eik5hag1u0uh1hg0bnagjoep/25908966606.pdf
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/3418b98650432529420bbc16ad6ee6cf/wowesuratanevawumisadam.pdf
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609863d5b0260---23079908890.pdf
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/p5tkmar6ehkuah3160ieg7f6ib/mitosotel.pdf
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6b733ff36---79349018195.pdf
    • http://alexanderjamesbackcatalogue.com/userfiles/file/97775096747.pdf
    • http://biosite.ru/images/news/file/nozabovere.pdf
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160889a3b8b94c---72377443976.pdf
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/49d5dff641e8af549d77a9b16e369363/videtewutusujugodu.pdf
    • http://inglewoodreunion.com/clients/68690/File/vevasajifafarejugoj.pdf
    • http://montpellier-businessplan.fr/mbp/upload/images/images/upload/ckfinder/binowiwatefigerapimis.pdf
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/4gpggars7h6cja6274cujmu623/nanek.pdf
    • https://chameleoncoupons.com/adgprocessing/uploads/files/91135093759.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=umts+interview+questions+and+answers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfec.bin
d986a96206d0dcfed564fd52fde6240788090536b713234966559bb8bb2828f4
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEC 10768 bytes
font_01_sfnt_off0000f88a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF88A 16792 bytes
font_02_sfnt_off0001109c.bin
d92c97c1eb04c3ca976ce6e47a453b8954778c2c04e251131cc17a394e95fbbe
pdf-font-stream PDF embedded font (sfnt) at offset 0x1109C 17492 bytes