Malicious PDF — malware analysis report

Static analysis result for SHA-256 df672dd355ac41fd…

MALICIOUS

PDF

85.2 KB Created: 2021-09-05 13:34:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: dc79f8afafa5a845f5f75b5a0c22076e SHA-1: a00a3c8ff82201381c830db8b3a4aa729718d3ed SHA-256: df672dd355ac41fdba3c306d3de26fb0cc1897d0dea7c343c9df0c3a32c17e21
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • 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.
  • 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://crewmak.ru/uplcv?utm_term=rapport+de+stage+licence+genie+civil+pdf PDF link annotation
    • https://amadesafar.ir/basefile/amadesafarir/files/69792318486.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/d77ec7dc11e6cf054104137cb820384c/95405832918.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/wemijuzivosurunimopazul.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/perenemudumesilon.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/27261641271.pdfIn PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/23639043337.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/281019415077.pdfIn PDF document text
    • https://limadelimon.com/images/file/zudegevokerizari.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/c8da96d1f5b201dcbb5c9b03dad3d57d/lisotazizirasurifu.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f719444356---89529692552.pdfIn PDF document text
    • http://tyextractor.com/d/files/mefegokuxaretogebug.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/dejidedosofenezedix.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/pejalimivanebonejar.pdfIn PDF document text
    • http://hk-keber.de/images/file/95835391476.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/timupug.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8b769cef9---sagovowas.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/11141890054.pdfIn PDF document text
    • http://hkalc.com/userfiles/bewujomivabanilit.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/vidozesamasirodej.pdfIn PDF document text
    • http://rhodeislandalpha.com/clients/56223/File/fuzibefu.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/70a708e3af3196b22451b7621f7998bd/58816156348.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/8146572300.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/53453a3aa66fa200d8e80067b277ad2e/58656933727.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608f81039dc07---65097534669.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/xovodel.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/4a3450367d82071992a4ac294920d62a/tibogunefekap.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/godutagakezol.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/52f864ec027244d489ba814f72d1b895/10882127002.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_off0000e65c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65C 17844 bytes
SHA-256: 51c2e48f7c7d5defbc8982139ef299f4cfbde30cb276aef2cdd5192bd928a571
font_01_sfnt_off00011507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11507 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D1E 10908 bytes
SHA-256: e26539cf269df24851a444f5c8cfc211a1a4a1123476229fa059dc9b3773eda4