Malicious PDF — malware analysis report

Static analysis result for SHA-256 de8574b5dba61087…

MALICIOUS

PDF

105.1 KB Created: 2021-07-25 10:38:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: b0be203b9fa8bf03a8d44fd6f5628c1d SHA-1: 8622db9d0532eca5d0731e312c3a8793420ab1de SHA-256: de8574b5dba6108759ffe76e9e8f78e8d2937f87af174152af3bb4432a01b9b7
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9666

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://philcoastal.net/ckfinder/userfiles/files/ganeloganosomomaz.pdf In PDF document text
    • http://henrycrawfordreunion.com/clients/1/19/1929e20d1ffebcad6d8b2a659e9c170d/File/61360521201.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6186f0bf94---17717338660.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/nasedadazunufesivebij.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f6e2c705e---99032901553.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd8c36ccc9---tamijosisizijopijofiv.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/b57167137177799885300242959f77b8/rumufunifidazidawaz.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/abbba7dafe5d599a23b3175cdca15a4f/vemogafirudisevivolop.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/87957683555.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/raluf.pdfIn PDF document text
    • https://beruanglucu.com/contents//files/59768483490.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f80a2995e7b---kukebubamajejowituv.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/a790f546d6bbe39c3e4519e3c259ca55/dowidokimiliwos.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/dojunagibemekug.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/74d77a0514a8ee774bcac3d44b372d28/baxeweguregamoze.pdfIn PDF document text
    • http://nicosiacaffe.it/file/92742115518.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/iplvp7o2a4beficnlricn0bshv/26463875280.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/k85ekve1vmr5jm9uughs1n6e31/lobexovane.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/badebi.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/livenomatotegodekemasofag.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/74271666945.pdfIn PDF document text
    • https://sealskinz.ru/files/file/35770478263.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/katedijesat.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/fbpmu8phjf9qeruj4ejl24k07j/xasulenararugete.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/25547543651.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075eabe471b9---44806992928.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f52927a2d6---90576930465.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=distribuci%C3%B3n+de+probabilidad+normal+est%C3%A1ndar+ejemplosPDF 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
font_00_sfnt_off00011f25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001373c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1373C 11364 bytes
SHA-256: ca72d644839aa3cc82eafae715cb25f93a2de725982fa0b7b9d4c7ac77133bba
font_02_sfnt_off0001510e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1510E 2736 bytes
SHA-256: f6e5f0d38c6eb52065291272ffe01dce830dc4d18e73609de5b8a8b1f3d53236
font_03_sfnt_off00015c88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C88 20492 bytes
SHA-256: 0b61a66f83ff64a3cb177f595fbdeb2f0e3734b6a162c06590f83ddac057c39d

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