Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd0f26c7da1c446f…

MALICIOUS

PDF

86.9 KB Created: 2021-07-26 03:37:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 16014accfcd7cc35305811e8fd495edd SHA-1: 3ed8180a84afb451abb48ad2b5aad5c78fd768fc SHA-256: fd0f26c7da1c446f0a2c6a2c2fd2e1ca75f3a89767ec19cf0e669f2ad017e2a5
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, likely intended to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing or trojan delivery. The presence of numerous URLs hosted on compromised CMS uploads suggests an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070783ac6139---pasokuve.pdf In PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097c004355cb---58660274961.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/r1q7gtjkb2s208qgeefhhsrnt4/fevomubixa.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16082acedee35b---24722024368.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/37327910222.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/42568522090.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/f6a86900a29046f7a9a9504ed8d1c6d2/13052567559.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/zadexefajitutidelo.pdfIn PDF document text
    • https://arbormaster.net/uploads/files/kejuxutifojisufubora.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/zobowejazesemorazos.pdfIn PDF document text
    • http://langmypham.com/luutru/files/xumuvu.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097e10ad0a54---841632490.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/guguziwu.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c4e23d88e---5103909722.pdfIn PDF document text
    • https://reniuved.it/file/gokotutatoretizite.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4917c45d7---53925188598.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/pasinuvidajomibava.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160bec0d4ebda3---47499114497.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8f57a1f24---78824164661.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/cd31b4885a452947a0435e70d5c70fe0/fokupodugulodojezedi.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/qbaisn4voehq8jrbft3vr26k9i/88796401615.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=planeacion+para+preescolar+2019PDF 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_off0000ec6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001047d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1047D 18588 bytes
SHA-256: 9cc6ca2ed033a1059e2d8d4eef1a910bb6ec11c60bf6e7bbabd009fcb9037cc0
font_02_sfnt_off0001337d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1337D 10732 bytes
SHA-256: 6eb8f1ee6ed8234fe33a4c5ddaf8bfa1072eb3c69c3442d051003158a05d81cd

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