Malicious PDF — malware analysis report

Static analysis result for SHA-256 190ce8419bbab912…

MALICIOUS

PDF

104.4 KB Created: 2021-07-31 16:42:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 24cbb40f296219a458acbdb9975c93ae SHA-1: 46fbe0b7515df6175c98c7009bfd84edce831ef9 SHA-256: 190ce8419bbab91292d2d34680fc168e46a05be35e1eb370ff498f68016f536a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV heuristic strongly indicate this PDF is malicious, specifically flagged as phishing/trojan. The document contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, forming a link farm. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing lures or redirectors for malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://tucarrorentacar.co/ckfinder/userfiles/files/49956667152.pdf In PDF document text
    • https://jxloanchien.com/style/postimage/file/xefawoz.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/20186815637.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/sj95vhv1lpqhjv0a7s958c7scs/dimewobikaxiwi.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210621050752_c6ah1o.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c8fd045d5de---96388206002.pdfIn PDF document text
    • http://panteres.com/files/files/fenepu.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202106250114139595.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080e33eb0dce---40321761422.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/togubesogukadobezefibapo.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd59394c24---185411592.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/17009414052.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f6e7d4ae7---78992048502.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/irk66j4gtjeo3edo9mdliek502/dawawovemupasumew.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ffc2329c3---59385393472.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/gigalorapigalepeduwedaf.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160889cf32dc01---25417159912.pdfIn PDF document text
    • http://airsoft1.ro/files/file/48757032518.pdfIn PDF document text
    • https://badoza.net/userfiles/file/40269420268.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/43800012485.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/tebixekujaworixumejadugo.pdfIn PDF document text
    • https://goodline.by/userfiles/file/witarisumupusuxanoluwigi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=troy+bilt+tb200+engine+owners+manualPDF link annotation
    • 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_off0001305f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1305F 18616 bytes
SHA-256: ae4661d1f84a95f0fab8b2fb4f238204614eb7996938fc37f5cb04d2fd88edc0
font_01_sfnt_off0001611c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1611C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17933 11096 bytes
SHA-256: 054cda68cf91a49d5319a7509e257c33e20e1ca0f5cac157770bc22ac2504226