Malicious PDF — malware analysis report

Static analysis result for SHA-256 510de74321bed998…

MALICIOUS

PDF

78.9 KB Created: 2021-09-07 08:36:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dffdd983ce0b884af1976c82154f0929 SHA-1: c410ffbfedb19e1f97282dd1f633af97190dfbe4 SHA-256: 510de74321bed9980a7202df9ee746213e6efb7e872c7cbc6290b4bb2f1ce556
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised websites, which is a common tactic for phishing or distributing further malware. The presence of external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://crewmak.ru/uplcv?utm_term=word+problems+for+3rd+grade+worksheets PDF link annotation
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/f5d51f58cf009f971602e04964585eba/36333918520.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6af6daba4---wuzarasilefasaxefiba.pdfIn PDF document text
    • https://hidropomp2008.com/uploads/userfiles/file/mefabuwixekozip.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/98023775962.pdfIn PDF document text
    • http://boeschfamilytravels.com/clients/43210/File/tinewaloruzobivo.pdfIn PDF document text
    • https://clubelsendero.com/img_pag/file/94652416314.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bbdaaa79825---51949890838.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fdf7e91c3---26815884143.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b16dcae74---92759004046.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/96572297695.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/xabel.pdfIn PDF document text
    • https://kar360.com/resimler/files/bikiligamubiwumekemimetu.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/3199b9dc17fe56ec25a27e556d5d1d44/nolowukolubefinume.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8c8361284---9106062016.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b21896c94---rizadidobomifis.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/48518612933.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094af188d3c3---30467851763.pdfIn PDF document text
    • http://nhs1980alumni.com/clients/878257/File/76647914976.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16072be7c99a8b---7690761058.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/visikadunewe.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/lijenovukosisizo.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7fc247b7d8---34613473053.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_off0000cee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE0 17444 bytes
SHA-256: c3a3bfc5476042246852bd60af1a41a3c3875cb814274866374b5c529d46ab90
font_01_sfnt_off0000fc5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5D 11232 bytes
SHA-256: 0300c0d17ce59dbdd9d622995a1b5e8a2ca941d5b80b8b26e771f37843da25fb
font_02_sfnt_off00011661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11661 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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