Malicious PDF — malware analysis report

Static analysis result for SHA-256 53fc4b61f0f3482f…

MALICIOUS

PDF

83.9 KB Created: 2021-09-02 16:47:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2826958dfb3229899df5f53351f58f29 SHA-1: 2f51caf857aea50fd89f58b1a6308ebd9d304151 SHA-256: 53fc4b61f0f3482f38656f21cbc0e386a62afd7f693e8939a782b5d0f63802a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting it's designed to redirect users to malicious sites. The presence of external URI links further supports its role as a distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://allytemp.ru/uplcv?utm_term=html+and+css+code+for+website+design+pdf PDF link annotation
    • http://hmsendo.pl/uploads/editor/file/65495373954.pdfIn PDF document text
    • http://veejaytechnologies.com/userfiles/file/pubujategeretobobizus.pdfIn PDF document text
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/federaforobujefupixil.pdfIn PDF document text
    • http://shihtzufurbabies.net/clients/d/d3/d383cf0c90cf2d2391705d5438694b4c/File/25017535455.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/joruje.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff68432781---93039098864.pdfIn PDF document text
    • http://inglewoodreunion.com/clients/68690/File/rejunutoxirizoduj.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/nujelemenewujisudiwugon.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad281ce4eb---38270057009.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/j9qj09v3tkk6i7iq206pqqfc5c/72632541768.pdfIn PDF document text
    • http://kalikraft.com/images/file/19187646057.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/49001310477.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/ha9bhs13k7hg9csa11qdvppdff/61121663094.pdfIn PDF document text
    • https://www.visitrwanda.com/wp-content/plugins/super-forms/uploads/php/files/d27020a8b1ccd75aaa1cb03ed19d2d9c/tipedamelubikadosobi.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c7d3a6c2a5---45888508630.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/nujisizababivop.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c620e3ed6---24192451068.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/nujikut.pdfIn PDF document text
    • https://gullyracing.it/admin/ckfinder/userfiles/files/30500476075.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/31296446653.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210530143810.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/75434ef7f4f434e40466c85024e82e7a/fomag.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160876fe7df771---4311759216.pdfIn PDF document text
    • http://ndt-ultratech.com/files/wijexavawevapevada.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_off0000e452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE452 16772 bytes
SHA-256: 2851c18a3fdeb63760f41e7a302b74445fe935678caedc30622c19cbee8fb3d6
font_01_sfnt_off00010fcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E2 11180 bytes
SHA-256: 4b01a05d101cf89c37ce5aeb93685738e625e9297c95420d549471c051c28232