Malicious PDF — malware analysis report

Static analysis result for SHA-256 c06505a59f64e15c…

MALICIOUS

PDF

87.5 KB Created: 2021-09-20 22:38:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8edfefb1af778b72b35a7dd0c088001b SHA-1: 02f409ee4f90daad6ce97357c9749bddcaa8456e SHA-256: c06505a59f64e15c2e98e7ac4d919cab7a654f5c9719dba226da5eb3d60da856
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links to external websites, many of which appear to be hosted on compromised WordPress installations or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the 'callback lure' heuristic suggest the document is designed to trick the user into visiting a malicious site or making a fraudulent call, likely for phishing or a scam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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.
  • 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://krisoc.ru/uplcv?utm_term=cara+repair+imei+android PDF link annotation
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e812d35e2---vuvalodoges.pdfIn PDF document text
    • https://harley.dataroom.tw/upload/files/negadanopopagin.pdfIn PDF document text
    • https://rheinfurth.de/userfiles/file/sajijurowabijat.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/18576835320.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16143dad3d4b29---58395577649.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210918215009_3z2wx8.pdfIn PDF document text
    • http://nwhouse.ru/uploads/file/37158482550.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161448336951ac---21577593077.pdfIn PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/vevinatujawexit.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/polizujuxazetimogon.pdfIn PDF document text
    • https://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/18420790102.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/zibifomuwowogesajigo.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/2lc29jjjh2me4la57tfgakv3b3/wixuxude.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/74726844205.pdfIn PDF document text
    • https://avukatwebsitesi.kocgrafik.net/upload/files/zokoruvodalum.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/3910575571.pdfIn PDF document text
    • https://wroclaw-effatha.pl/grafiki/file/56782831861.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/wuneguxapudanina.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/jusawuketawanuxanig.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/49916226699.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/surevevimale.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/bikisuvifexalo.pdfIn PDF document text
    • http://ore-processing.ru/d/files/rasel.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/10186253773.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/eb668357119e599ce78d576c4c5176b4/81261213966.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_off0000f20c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20C 10272 bytes
SHA-256: 9211849278ae6d40c2486251cae2421d2726fba2c709657cff75cc0e6fd09fe0
font_01_sfnt_off00010905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10905 17980 bytes
SHA-256: fad66be2fa71791d3c9d4d5239a8eb27eab5a016b4f9a86fa9bcdcc0679666de
font_02_sfnt_off0001384b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1384B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.