Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4c25f623f1292d4…

MALICIOUS

PDF

99.5 KB Created: 2021-08-30 18:26:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 5315ee050fd2c4807e325e04040d3138 SHA-1: c987567c63d3d2edeb23e06f2bc0bb6998d4c1f3 SHA-256: d4c25f623f1292d4f35a805626f101a6eb2938b3f57f225b9cd261a4eb8e92bd
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or domains associated with link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links on potentially compromised infrastructure suggests an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://catamma.ru/uplcv?utm_term=find+restricted+values+of+x+calculator PDF link annotation
    • http://szao-spb.ru/images/news/file/10658798735.pdfIn PDF document text
    • http://frutapacargentina.com/ckfinder/userfiles/files/wugaxetenij.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c1aae2f7a---fefuniwanubedebu.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/bojenitexipiseki.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/7945833873.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e2a781dc690---superezebibegoxaj.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/kifomirerifavisolowodiwif.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/61365382904.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612aedb24a1fd---75640950597.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/9b7d9d9789b7650b5d824bd97a0794dd/sibepakijifumako.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/fefdcd5e611d2840a628c712c67520be/8097725948.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ca2494407---mogaduvurun.pdfIn PDF document text
    • https://brod-plovdiv.com/images/funavozarexonibilin.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e81bf42c76---gixizufejusefupe.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/zekijuvaworemol.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/fidef.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/14054294835.pdfIn PDF document text
    • https://cupanghitam.com/contents//files/78244100316.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/sitolekodijerozamobije.pdfIn PDF document text
    • http://praguetransfer.com/files/file/98252764914.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/jasekitovuf.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1608501827aa31---98253358436.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/u4k0hmk5kuecebe6he0c6fdt07/70081562115.pdfIn PDF document text
    • http://hbleg.com/admin/userfiles/files/gorexajisumajorirobo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c63f050354c---zepezofupigenegima.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_off00011f75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001378c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1378C 10716 bytes
SHA-256: 17f481514450ed1d7fabb87184db19b74a64ac1c3fa37bb8190848c66468c093
font_02_sfnt_off00015042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15042 18184 bytes
SHA-256: ce613ee162093c2b668cf18fdb30ae1d13eddcdcf5e8429f0aaabc585bb49b86

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