Malicious PDF — malware analysis report

Static analysis result for SHA-256 d18273e16e1e185c…

MALICIOUS

PDF

101.9 KB Created: 2021-09-17 06:53:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f1cd4d53113611099be013cd7140338d SHA-1: 031934fc4264c71875076a5898bb1977cee81050 SHA-256: d18273e16e1e185c3a39df8e0a4f7b21cd0d5feaea9cea2d5f19e6989246704f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://gsnursing.in/ckeditor/ckfinder/userfiles/files/97003007296.pdf In PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/xefefepu.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/jajesozisaxunos.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/gbohs5p714eqakoj44b0loe0dm/30366715216.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/64863519477.pdfIn PDF document text
    • http://cutskytools.com/d/files/3175067441.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/80978685030.pdfIn PDF document text
    • http://alhegazgroup.com/userfiles/file/91374364792.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/27535808562.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16143b0aa8f691---91280083102.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/50793676469.pdfIn PDF document text
    • http://globalsublimation.net/uploadfile/files/fubalefokinarisofutas.pdfIn PDF document text
    • https://igk-lilienthal.de/downloads/wezufezifu.pdfIn PDF document text
    • https://thefencedocumentary.ca/adminfiles/file/92877094378.pdfIn PDF document text
    • http://rnralpha.cz/res/file/tewur.pdfIn PDF document text
    • http://manchetenewsms.com.br/ckfinder/userfiles/files/9380949376.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/gefokuxi.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/109327092.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/6ebca128d31345a145d7df6edcf0479b/tapapalilevire.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/18419629480.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/pewadesowafukodeb.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/74073134797.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/kuzeturaxugabuladaxu.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/86192571953.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=the+art+of+the+good+life+rolf+dobelli+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_off00012a78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001428a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1428A 18348 bytes
SHA-256: 1d8a081f7cd0934136cc664c6a243e155db3864b1a314fb4683df806e41b5ba3
font_02_sfnt_off00017175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17175 10608 bytes
SHA-256: 91afd92d0fd94a3328fff0c5cac2b96a5d3e4f49def44f022da64af94aea2074