Malicious PDF — malware analysis report

Static analysis result for SHA-256 3162470e3a9593a7…

MALICIOUS

PDF

81.4 KB Created: 2021-10-05 11:18:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f7ac3e2f78570ccb282ca0ca6e1a2134 SHA-1: 3af731ffdb325728e34dd226d1e11adc75f83296 SHA-256: 3162470e3a9593a713bcc7e009719c9f75b918b1a7aa20dac6b1f0f49edebde5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://school15-tyumen.ru/f/napulatebiz.pdf In PDF document text
    • http://tbeaindia.com/userfiles/file/vilukawiwiniw.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614d2539dc0fb---jituwiwof.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/72018043203.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/96049678240.pdfIn PDF document text
    • https://thietbixanh.net/uploads/files/zojovejujavemujumu.pdfIn PDF document text
    • http://spbi.cz/res/file/xaxavixexotilagorumuvi.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612faadde1937---fuladorige.pdfIn PDF document text
    • http://poultech.net/d/files/towalaketekodaw.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/81938484058.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/33686788333.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/ea0578c4be1f4efecf1f8d556759664c/xutemuv.pdfIn PDF document text
    • https://usgcambodia.com/userfiles/file/volap.pdfIn PDF document text
    • https://drterrace.com/london-100.com/userfiles/file/17682656373.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/19558144687.pdfIn PDF document text
    • http://tg-focus.ru/userfiles/files/miwor.pdfIn PDF document text
    • http://millecolori.it/images/file/sumopukimeniwuzabipuso.pdfIn PDF document text
    • http://terrietanaka.com/library/files/jumerabefimudogewesesadef.pdfIn PDF document text
    • https://visualmotion.nl/uploads/file/werexi.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/24012482543.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/91770086646.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/wudilefa.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/3962900604.pdfIn PDF document text
    • http://kccmaul.com/files/files/monipakoril.pdfIn PDF document text
    • http://dsagco.com/Upload/file/maxoku.pdfIn PDF document text
    • http://zuche0551.com/upload/file/20302167389.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+many+kings+are+there+in+a+deck+of+cardsPDF 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_off0000d2de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2DE 11160 bytes
SHA-256: dfe8c0302d69fa6bf61d3f992e578cc8e0d45beae7d0112e97c9645295ab18f9
font_01_sfnt_off0000ec9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B1 19856 bytes
SHA-256: 06668c6a86b5bfdaf33e132385f8389ccff5406807794c2eba9d7aed0dad91e0