Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd03e499ccd436fb…

MALICIOUS

PDF

89.6 KB Created: 2021-09-06 14:50:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a71dd1e26fcfd88635f4bf6018d99a96 SHA-1: a8d6eb452b2aaa30f7645f759d3c3268c4d02097 SHA-256: cd03e499ccd436fb4801f684f9e346f1a6ca1cafe12202e798afb5a88affbbdd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://huntic.ru/uplcv?utm_term=probability+exercises+solutions+pdf PDF link annotation
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/93604284826.pdfIn PDF document text
    • https://pharmawell.eu/ckfinder/userfiles/files/gukipomiretowofejijexoti.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/55582489477.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/lijakajogimelizunuximig.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/37250423038.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607568435e45f---79197428668.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/nomijodigiwosujigaxa.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/tivopegoxuwupebo.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/fe666201833d4baedbe82377cdc3b807/76375793500.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612cc2ccc6b3a---xerovowove.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/zavuwi.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609dcedc49614---vuvurivewazaja.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/18912676552.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/12228191092.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/renogovuvakofefuwurogilu.pdfIn PDF document text
    • http://globaltruthmediagroup.com/clients/a/aa/aa8380eac451876ae6ab993bf3a720d6/File/piwesofukiromolugul.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16075d23fcf80a---2653040991.pdfIn PDF document text
    • http://sun-tes.ru/files/file/72440723079.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/q8jmj6nh9i0h9n4cnmhtvgfbc4/92598806578.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/pogibiluwusipuwu.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/g2sdt858cau9blsavorgklvj2r/movimexilu.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/92367714342.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_off0000f781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF781 17864 bytes
SHA-256: 6f1baebb118b3e6f1e9ab85e09ebd9d103de42505f42264cf37d6020ed3d84c8
font_01_sfnt_off00012697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12697 11072 bytes
SHA-256: 310033120deb5081a8642ed18e1edbc6049ee3468775cd7eefb7e0d9a0dfbee0
font_02_sfnt_off00014055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14055 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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