Malicious PDF — malware analysis report

Static analysis result for SHA-256 a110647d3a4f0cc7…

MALICIOUS

PDF

83.7 KB Created: 2021-09-01 06:28:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 044cf9f3ed92531adf6ac6ce4ee8cbcf SHA-1: 2efd2cce6f2843eb4371ff5c143f75234c49a889 SHA-256: a110647d3a4f0cc7d1940f6b50cb8537b9ee3827e0338c1579bf5e45b9ea9cef
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised CMS upload directories and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and link farm indicate it's designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://viboot.com/ckfinder/userfiles/files/99881817385.pdf In PDF document text
    • http://derkwoo.com/upload/editor/files/28305628600.pdfIn PDF document text
    • http://xedaphcm.com/luutru/files/31095729595.pdfIn PDF document text
    • http://bosch-service-center.ru/uploads/files/44807269265.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a05e9ba94c7---51479607469.pdfIn PDF document text
    • http://szybkieprawko.pl/szybkieprawko.pl/user/admin/fck//file/5587863444.pdfIn PDF document text
    • https://bachson.net/upload/file/fajedujekal.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/podesajuxunadomozamepan.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160f44cf7c2d4e---naseleb.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfd9317044---jeluzumewumisamonuxoxu.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a18164e7561---nisakigivunebawot.pdfIn PDF document text
    • https://porterbrothersltd.com/app/webroot/uploads/lomumexa.pdfIn PDF document text
    • http://vigova.vn/Images_upload/files/jobowoxazipekemazug.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a9891dc2ba8---birorimupogerurakok.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/20431472567.pdfIn PDF document text
    • http://fsf-vastroad.com/userfiles/file/tanakiximapome.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff7f1ee4b2---22959351790.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a41bf5cfea2---94962908653.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/m9hkfavh24eens9451gtb1hfr6/88713375073.pdfIn PDF document text
    • https://latework.cz/soubory/lekog.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077ad4169dca---bilivadupusavamutozew.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/nuwuzokuvebujugisijef.pdfIn PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/85030463766.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=s200+service+manualPDF link annotation
    • 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_off0000e039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE039 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF850 10656 bytes
SHA-256: e076100699d63814d0eab8c48975e3e684dbb5b2dbcd998b7e96025e6b9b799d
font_02_sfnt_off000110c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C3 18112 bytes
SHA-256: a87a5cae7615b046a0df7b1063cea76fafee23fafa37b122fe416a6c0197a8db

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