Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b2375fd7664ad5e…

MALICIOUS

PDF

79.4 KB Created: 2021-09-07 15:54:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 08f67efc3c61b395bddd1cdc95a9a23e SHA-1: 92dd44c97bd22760db3443faecf1e8f71222f76e SHA-256: 7b2375fd7664ad5e1ea3cb56459788b633604383b6d81e0190a574c3451590d8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm or redirection scheme. The presence of these URLs and the overall detection indicate the file is designed to lead users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://smidgel.ru/uplcv?utm_term=wetzel+pretzel+job+application+pdf PDF link annotation
    • https://paklya.su/design/img/upload/file/30190300818.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/wozezajebuteroreve.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/pusivijuzavowokafojo.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/92445887644.pdfIn PDF document text
    • http://bhs1966maui.com/clients/64750/File/mujoburezomeridokusup.pdfIn PDF document text
    • https://vientangluc.com/upload/files/refutuwomowu.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/t63vuck5vaj7ksg39q5q8sr3i3/bigido.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/17660353392.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/wizagonetuzogavopobipug.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160add39d80aca---zagoxugodubuwamejaveras.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/t9effujt11oeeqqgatghe5gcn1/debudebemela.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bd11715f053---gowoloputetowujunaza.pdfIn PDF document text
    • http://lucchetta.net/userfiles/files/21186404517.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/52212495195.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a25982e9e99---lazupopoxatovopev.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/77152936769.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/90049269077.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160e50c8814be4---53912757064.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/69002339142.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16074ad2ad27f2---22827865061.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b55a5a6ab86---79078572465.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/d4980d07215a4283c944d81717e1a91e/58011122689.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/75231948185.pdfIn PDF document text
    • https://yuktogel.com/contents//files/5099875185.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/66218104518.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_off0000d460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD460 17072 bytes
SHA-256: ad5ecfcf89fe1dfc19f260fb2ef35b123aedc5a081ee5f815882b31d272fc0f2
font_01_sfnt_off0000ff11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF11 10768 bytes
SHA-256: 4b447dc7150cef5611a1027b4356ddad85e07bba935d6ae248105f26dd2c9c51
font_02_sfnt_off000117bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1