Malicious PDF — malware analysis report

Static analysis result for SHA-256 99adcc22ce9d0e1f…

MALICIOUS

PDF

77.5 KB Created: 2021-09-04 12:12:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ea34f6892340d35be4a6c5c7ff4b0cfb SHA-1: 487c77c4899ac3243138e612795dee43f6a1fcfd SHA-256: 99adcc22ce9d0e1f14db53a8d388b427ae4421ef44262b638387c3708ea56890
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, forming a link farm. The embedded JavaScript likely facilitates the redirection to these external sites, which are designed to lure users into downloading further malicious content or engaging in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nomylo.ru/uplcv?utm_term=subhash+kashyap+polity+pdf+in+english PDF link annotation
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/5d18c925eceb1ed36d61c4476d1cefd3/mamagizuzivabodebuge.pdfIn PDF document text
    • http://contextuae.com/resimler/files/bagaduronufadibir.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ffed9aae167---vekuvoko.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609a42508898a---vorelakinozetududage.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/486e90ca82f2a2eec4401a6f98ef2e63/pevelumamoridapivesav.pdfIn PDF document text
    • http://mobilephleb.com/clients/2/2d/2d2188d13063160162e6e2bbcdac547d/File/66055259078.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097f919c1496---26403453336.pdfIn PDF document text
    • http://jkohut.pl/file/vemujaxure.pdfIn PDF document text
    • http://auapp.ch/userfiles/files/tenilewivafusoreju.pdfIn PDF document text
    • http://youzedu.com/ckimages/files/20210829131904495315.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/c9f237c5bf1bfe10da96783eafcf25fb/53843797242.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16086b634e164b---romonoxurowozabukozena.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/fuxovofanuguzaforideb.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/regusemoxepukamide.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/66474745429.pdfIn PDF document text
    • http://rsst77.ru/upload/files/nimojufurazisovu.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/juzovalodejezew.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/takokinaxokevuxetof.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160755a230584f---riwabozugugozuroxuluz.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609da9dd76527---bumifarudufobonanal.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/5756ef60fe478f79ae6c3074e4566fb0/nepasebanuvoni.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096ffa4941af---65941376240.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/c608a13f99010816577b98bff9d19b3b/sifar.pdfIn PDF document text
    • http://teplospectr.ru/images/files/6892490937.pdfIn PDF document text
    • http://dostrojar.sk/UserFiles/file/85895992121.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E1 17160 bytes
SHA-256: d80c04d08bc88a613b2c4072443f028fca21dd85fc3b0a69db1db712f7958788
font_02_sfnt_off00010e8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8C 11200 bytes
SHA-256: 962e2504928ccd7223b20a9b3b15e044f0df6d7e5c1a63db755d427e24c4fb0c

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