Malicious PDF — malware analysis report

Static analysis result for SHA-256 610ee76cb82aa020…

MALICIOUS

PDF

86.3 KB Created: 2021-09-07 14:50:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4c6204c3665749c47e309a29250b9791 SHA-1: f5c67e425e1ed3c1b803345692bdc0c0cfbcd92c SHA-256: 610ee76cb82aa02054e164178326af1cae8eafd416a6cfa47be419cfe2d3f510
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous URLs, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' parameters in some URLs indicates a potential phishing or SEO manipulation tactic.

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://crewmak.ru/uplcv?utm_term=t%C3%BCrklerin+tarihi+jean+paul+roux+pdf PDF link annotation
    • https://grandegroup.net/files/fipisu.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/nufileforujanetew.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/36116754652.pdfIn PDF document text
    • http://tarnava.eu/user_images/file/vezagiruk.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/78168483098.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/89788926106.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/lijamefiduvida.pdfIn PDF document text
    • http://dreamsurgerycn.com/ckupload/files/7239755641.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/22830535652.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe6e822055---mobaban.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/43937995958.pdfIn PDF document text
    • http://adveotec.com/img/file/30484811122.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092602ad2049---66941537064.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/71003768006.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/63258085108.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/ac41147f2d87ced9ebdc8d40c10977bf/zidibofe.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/47692149023.pdfIn PDF document text
    • http://tomdythai.com/userfiles/files/95158983645.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/2j6tn439rq2ig9o3rvtsdapfof/66350597405.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acd6b288045---muzowemujenorazevomenas.pdfIn PDF document text
    • http://vindindex.nl/images/uploads/wifozozajiw.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfbbbc1b43---bekijufotufudeteb.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/parexexafebolenapaz.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a69fb581dd---20717363048.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/lac7q3oepanfjtl4oc2eumf6al/dopuzo.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_off0000e612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE612 20552 bytes
SHA-256: 46588e4cb766d859ad28104130ce73f249c8a30a58fdf86141c32b36e5a1e8ee
font_01_sfnt_off000117e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E9 11008 bytes
SHA-256: 5dcaa8ba1cb6854303a341ae8812a9ed2cb7fe52641ebbb13241d9f5ff3c9f05
font_02_sfnt_off00013112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13112 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1