Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc2ac2525b3fb9c1…

MALICIOUS

PDF

77.3 KB Created: 2021-06-28 15:19:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 618d29323835320b24639f38aefcb0bb SHA-1: f5e1b1b397765b1edf2f5cecdfb596840e7f0685 SHA-256: cc2ac2525b3fb9c13e8adc68986d0cd094eb5f94c4db1b7b09dd3297cf858ebd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is unreadable, but the presence of these link farms suggests an attempt to drive traffic to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b912248d47---bidakava.pdf
    • http://utuin.net/files/fckeditor/file/5987455951.pdf
    • http://congtyvima.com/images/Download/kaxelilibaku.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609cfd5021278---zuduruzusug.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/acf4ca27ccc6045564ef743ecb8fc767/wufilojepakonovunipabaret.pdf
    • http://alnoorcity.com/userfiles/file/33367598601.pdf
    • http://brenno-tojestto.pl/userfiles/file/9487403299.pdf
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/75148573128.pdf
    • https://aplusadvance.com/naver_editor/data/file/rulugewefuvarumipikupij.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/jkq3av3dnpenjlve658u9oqca1/31026718382.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/b84d15e9e00d5c6ea28c1eaf37243afc/tozudulekewizene.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16099f8f938847---zezimi.pdf
    • http://thanhlapcongtykiengiang.com/upload/ck/files/59335845201.pdf
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/ccd2773cf7b3aefc8a84ca9de52107f8/givagenuxomujosunajazo.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce76b9f490---figugukofexokazor.pdf
    • http://www.kymkarajok.net/tiedostot/files/woxubeja.pdf
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/vat4j1aqc7vh25pbdoe6l1udno/88201003081.pdf
    • http://clubmaniacr.com/campannas/file/90228579853.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe3e42c269---28336373686.pdf
    • http://praconsulgroup.ru/pict/file/nuwisogixajixadususoti.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d29b4176e07---80867191496.pdf
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/be08bd4ee4ee0da78f0178a449cf3743/zupotamo.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a30924d5175---wisaralutuluxijoxofa.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=shouldnt+have+to
    • 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_off0000cecc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCECC 16792 bytes
font_01_sfnt_off0000e6e3.bin
0d55dfd1f5601bab485d8f5f913e1d1f73fc6960839ab94e6662570e4bc3f108
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E3 10224 bytes
font_02_sfnt_off0000fdd8.bin
0744b8c863e4fc4307a3f3e34b216a90768f1d48701c06d409e4d847e9fafda7
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD8 16488 bytes