Malicious PDF — malware analysis report

Static analysis result for SHA-256 42d8517cd2a5152f…

MALICIOUS

PDF

82.5 KB Created: 2021-09-04 17:34:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 633f92e7c931ea7a4a718cc892043a96 SHA-1: 3fa422f628a16362e8d8324149d8222df4f989f0 SHA-256: 42d8517cd2a5152fb16caeadb2522fd1f4f5f713cc745b1f4cb028710b8fd3d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, many of which are hosted on compromised CMS platforms or disposable domains. The presence of numerous URLs, including those with 'utm_term' parameters, suggests an attempt to lure users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://synerhu.ru/uplcv?utm_term=minuterie+%C3%A9lectronique+pdf PDF link annotation
    • https://euroroma-bg.org/files/file/14526181215.pdfIn PDF document text
    • https://patc.fr/imagesfile/48247591506.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9aef5b63f---78482665317.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/5lgb5e4lju14a0a91667h4d585/41147606799.pdfIn PDF document text
    • http://re-media.ru/foto/ck/files/gukevaliwepumal.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/0u1h2tjqgfspvmt61v73f8dsud/70232417712.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/fenomumasuv.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/xutemebutelo.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/moderunod.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/84521289326.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160f7b8da5f68a---14120168733.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/mizeluvex.pdfIn PDF document text
    • http://xn--80aer5aza.xn----htbdepbihnfb8cyg.xn--p1ai/ckfinder/userfiles/files/wawabezivilalesefamizaxul.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/48392946510.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/cad2da381a1ba68b86d85bb188e65f2c/86658292114.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/gesasilovikodulasasejo.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/96190633262.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/wasozovegi.pdfIn PDF document text
    • http://xn--42c1dhzaq5aeb.com/userfiles/files/zowujinamidu.pdfIn PDF document text
    • http://ndt-ultratech.com/files/51430244221.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/8596f51621f6636a3bebdbaf68fdd559/zewaseralitorisagegoritid.pdfIn PDF document text
    • https://webmenuplus.com/images/file/navizegoboruditata.pdfIn PDF document text
    • http://www.truca-taoules.com//ckfinder/userfiles/files/fuzukizivulataxategosisiw.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161110d138fe6d---65787556896.pdfIn PDF document text
    • http://arablift.net/userfiles/file/5654114573.pdfIn PDF document text
    • https://maconlux.ovh/userfiles/files/12797081621.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_off0000d79d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAF 20088 bytes
SHA-256: 176e8b7daa24308830e7c393fce57454e325d401664f10703ec6c0672e91524a
font_02_sfnt_off00012256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12256 10676 bytes
SHA-256: 22a9fff7a570f9248fd7f5d3ae4d8f6f2544c8ac0b5ba750155f0773484f5ff0

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