Malicious PDF — malware analysis report

Static analysis result for SHA-256 67dbc22cd2eb238b…

MALICIOUS

PDF

100.1 KB Created: 2021-09-05 19:48:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 06e5813b1c2d27361e2d9fe88f603ea1 SHA-1: 982b11d143f3527c47f3482b26abed2317626566 SHA-256: 67dbc22cd2eb238bf031b94b21d8d75b117a571bab3d4c999924187bd35a2903
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to obscure the ultimate destination and evade detection. The primary purpose appears to be redirecting users to malicious sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16098358492ba8---jixivefalivotozoluseku.pdf In PDF document text
    • https://girilawfirm.com/content_files/files/fipekebugajemed.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/4a81ec0ad914685d92eb5976b3be6637/nesuguniliv.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210522144533125.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/segafovomalowasax.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f5c5934efb9---vosug.pdfIn PDF document text
    • https://vetregistr.com/ckfinder/userfiles/files/duvanupofuk.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/42673069427.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/9c8fd8424078aebf9afb7628a6f8b773/10927134160.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/pudenatoxibezijuzum.pdfIn PDF document text
    • http://ticketsperiodico.com/galeria/files/29622185411.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/7310513dc28c17d391b3e2d6047451a1/41434566602.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b8e0ddcab---givojikodulemobemonanod.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/biwonolesesav.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/20157699500.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/70492752126.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/jizefasozizuwifufufiwigu.pdfIn PDF document text
    • http://topcudental.com/img/userfiles/files/xezobaf.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/pidafomomageluzagasemago.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/jefumuritunosazetupitar.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160b553be82de4---xuvonadujadijuzirigowos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=mazda+mpv+1998+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000133a6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x133A6 18992 bytes
SHA-256: fa806d945a7a1505397fd12ec560cc13e31607d04888f6303db3b6622f0581c1
font_00_sfnt_off0000fe0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0D 20572 bytes
SHA-256: 7673d74085dc03069776dc496bf06b2fd58801cad9260292f1585e59008641a2
font_02_sfnt_off00015222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15222 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00016a39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A39 10488 bytes
SHA-256: 8aa03916533f33c625960d8bce6c23f991930576bba744bd98278fca26d6108e

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