Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a80b007c9f8ad67…

MALICIOUS

PDF

74.6 KB Created: 2021-09-18 08:35:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f674d667f2f46a3cfbd0ff0764c8cdd3 SHA-1: fddc15cdd52e647ed45b4887a28585c1fead3ed9 SHA-256: 5a80b007c9f8ad67f38fff80585636cde82040a6d12986670b2ef79f543bc751
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://allytemp.ru/uplcv?utm_term=the+giver+chapter+22+summary PDF link annotation
    • https://kingdomofgodmn.org/userfiles/files/42973514747.pdfIn PDF document text
    • https://raovat72.vn/uploads/news_file/duwisena.pdfIn PDF document text
    • http://greenbiotech.vn/uploads/userfiles/file/68256334205.pdfIn PDF document text
    • http://bienbao.net/uploads/files/25935524198.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/30923989681.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/27758574889.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/xexagozilaxager.pdfIn PDF document text
    • https://classoft.ro/userfiles/file/wixejelenat.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/peresakatix.pdfIn PDF document text
    • http://thcsducthang.pgdbactuliem.edu.vn/ckfinder/userfiles/files/42009737073.pdfIn PDF document text
    • https://sapporomn.com/userfiles/files/jatisukin.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145728786d53---72272633032.pdfIn PDF document text
    • http://ejmk.com/ej/upload/files/8846685917.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/vixavawata.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb5b939130---99250862097.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/negavijalizosoxunidu.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/fewunirulejujilelesu.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613f050b1e957---79809816633.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/680573834.pdfIn PDF document text
    • http://shopabrang.com/images/files/31301851518.pdfIn PDF document text
    • http://15881588.com/ckupload/files/mifoteruzazotatowafunujo.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_off0000c077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC077 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d88e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88E 10916 bytes
SHA-256: 7bdf388a8bfebd1c0f6295af2f2d8d7269d93fd1c3de5400a3d520c5e58d2989
font_02_sfnt_off0000f1f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F9 16996 bytes
SHA-256: 241d31a92abcbf6cf05a933837f2ef227a64a85baaa93394361fb7274d7a8dc5