Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ed7c4d491a9ebd9…

MALICIOUS

PDF

83.5 KB Created: 2021-09-07 14:05:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 87d14f8dd3d638252a6f2c066584b216 SHA-1: eb9b756b4098c3124e1ed957e9c94d8a62cc8ca5 SHA-256: 2ed7c4d491a9ebd966970b21ef70d5e93420b2967d3fe2b714cbafd660241e57
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm patterns, indicating a likely phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of links pointing to compromised WordPress upload storage further supports the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://infrive.ru/uplcv?utm_term=la+petite+femelle+philippe+jaenada+pdf
    • http://mousike.it/img_ins/files/xixasumuzopumaz.pdf
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/do0fd3o7d9pe47obhjqm45jvas/54268114705.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed341186e7---ganetagurebemokegodilejiz.pdf
    • https://transport-vehicules.fr/userfiles/file/38251236485.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d4cd4f4d8---pofun.pdf
    • http://bertrandetgastineaudesigners.com/userfiles/file/76732333363.pdf
    • https://publicbridge.pl/userfiles/file/97796875504.pdf
    • http://khodahoanglang.com/admin/webroot/upload/image/files/mukenoponofivesuvufal.pdf
    • https://a2designbg.com/userfiles/file/4887940730.pdf
    • https://nasikampung.info/contents//files/55326525246.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607aaa9adcfbc---78904489610.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16089219cb74c4---75495405575.pdf
    • http://baobianhkhang.com/upload/files/43573137188.pdf
    • http://danielbushreunion.com/clients/41596/File/ranivawuvefusegenaso.pdf
    • https://cs168.tw/upfiles/editor/files/47690137372.pdf
    • https://jagominum.com/contents//files/55012315693.pdf
    • http://dalaichau.com/files/68596938380.pdf
    • https://aplusadvance.com/naver_editor/data/file/fuluveritav.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8bb2dcd99c---49506553795.pdf
    • http://swiftnb.com/ckfinder/userfiles/files/kosavatukumopasomowile.pdf
    • http://innova-perila.ru/upload/files/48586211047.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130645eb6779---37902091564.pdf
    • https://eternalbliss.net/file/morotalam.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/2a94906af0021a07bf23013cfc11338c/lanuxi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dce9.bin
c0375c0089521520d37361c8864fde2e3555f9eb66f79e720b282b971eaa4206
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE9 10460 bytes
font_01_sfnt_off0000f45d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF45D 16792 bytes
font_02_sfnt_off00010c6f.bin
18a53259371378af190e1303f5f7e45a7ba450335932fb21ffab9386c90e69e2
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C6F 20624 bytes