Malicious PDF — malware analysis report

Static analysis result for SHA-256 614009c514863ab2…

MALICIOUS

PDF

80.7 KB Created: 2021-08-23 13:37:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 78166866b6ddef1168dd94e79902e5a7 SHA-1: 252a328b7e969a1af155d876f599396a800c5000 SHA-256: 614009c514863ab25314ab1b7a26e22be6a095a7b2a180a158d0c2d54231f111
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous embedded URLs pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://drafthe.ru/uplcv?utm_term=access+relational+database PDF link annotation
    • http://cooperclassof1970.com/clients/9656/File/64299730810.pdfIn PDF document text
    • http://kavtas.com/images_upload/files/dopewirananogofazota.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/2ka43kb17sgrbguir2fenu5hvd/weburuwijuwovolijugofu.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/14193450710.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611079e3953e2---950205542.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609045cf8ffb4---kuboposubalexixibib.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/e6c1b00d4ac1e890e2e3e80c593d2018/gazexudazuruwakujalorax.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/duxuvunakuvufajaxexinikot.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098939989d7d---36243624837.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160859d5ac5aad---12375586077.pdfIn PDF document text
    • https://123natura.com/stockages/files/56711425851.pdfIn PDF document text
    • http://auldskoolrocks.com/clients/878384/File/1616278442.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/wilumewupelezet.pdfIn PDF document text
    • http://avalon-essenzen.at/userfiles/file/bifamebiwovinigefu.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/41133921382.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/81904275349.pdfIn PDF document text
    • http://kaies.cn/upfiles/2107230534394419606dwt8s.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/metokimizumokufop.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/161135a3be50a9---tixodo.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072d161ed292---pugizejedusenuwatiwuru.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/fevojob.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073175a300ee---jitewokizapinaga.pdfIn PDF document text
    • 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_off0000da76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA76 10484 bytes
SHA-256: e98425b3dd8d08e89b786c153f545fd7de24c5f72f2222db1df8b4f07423d755
font_01_sfnt_off0000f26c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7E 16408 bytes
SHA-256: ae3edd86ad250e5c5f0cbdad6e91cacbce9e92e364e73440a8b2d86923390f8c

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