Malicious PDF — malware analysis report

Static analysis result for SHA-256 0acfaa7798709124…

MALICIOUS

PDF

86.0 KB Created: 2021-09-18 23:46:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d9f0bf2dc71df8cecd56b9e0cb70a50f SHA-1: 507a3b32507afb27d7ed3d0f0aa0708729bf4a4e SHA-256: 0acfaa77987091240f110500fac47faa9b6210f0ef61d0d3c895451e7669672e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of link farms hosted on potentially compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://infrive.ru/uplcv?utm_term=keeps+stopping+android+app PDF link annotation
    • http://dotbamboo.com/file_media/file_image/file/pedasibor.pdfIn PDF document text
    • https://www.milestonesmn.org/ckfinder/userfiles/files/fomokigote.pdfIn PDF document text
    • http://wernitznigg.at/files/5853202464.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/51832472324.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/reketijevitofegudu.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b12fe3895---48698470481.pdfIn PDF document text
    • https://membermimpi.com/contents/files/sufavifinakinuki.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/1549320964.pdfIn PDF document text
    • http://mecaniquekd.ca/upload/file/66205101673.pdfIn PDF document text
    • http://specimport.by/files/files/zikovezejuju.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/26404521667.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/fdf3fd74091f4a29156ef3ccf28fb2a6/95906408370.pdfIn PDF document text
    • https://thegmsbihta.in/userfiles/file/ragin.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/paxokanegezejatufosila.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/623f9c7623ae8a2602b62b3be7da212a/43897892817.pdfIn PDF document text
    • http://avon-bratislava.sk/files/files/61356356583.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/vabivo.pdfIn PDF document text
    • http://www.motocams.cz/ckfinder/userfiles/files/zixepi.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/tasewosafovapimuponikip.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/puporibudijafiregitiba.pdfIn PDF document text
    • http://sinocelltech.com/filespath/files/20210917042559.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/27968034884.pdfIn PDF document text
    • http://teleinwestor.pl/userfiles/file/lijirerumutuzunajakepaji.pdfIn PDF document text
    • http://svx.su/ffile/file/wuxugenalusozidumiperer.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_off0000ed05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED05 10512 bytes
SHA-256: db8a9dd1a5eb45ae7547414ae9ebd8e62b3717be7dff832d32bf32cff868122a
font_01_sfnt_off000104e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E4 17444 bytes
SHA-256: 2f823edbad6f77cbf281fe1ffe1751438550e0183f0b434d369f6f45a4c12f92
font_02_sfnt_off00013253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13253 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1