Malicious PDF — malware analysis report

Static analysis result for SHA-256 20816edda804bee9…

MALICIOUS

PDF

91.0 KB Created: 2021-08-14 18:31:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 90129545c609ee21723470d438a686cf SHA-1: 64ca71c6a4df9d9518a5a53812522bce546925af SHA-256: 20816edda804bee9fe714b813af4ad764286875a34477b58d601f51a400fb223
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The document body is unreadable, but the presence of external links and the high confidence verdict indicate a malicious intent to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://irlanc.ru/uplcv?utm_term=failure+mode+and+effects+analysis+example+pdf PDF link annotation
    • http://uptownchantilly.com/uploads/files/gofamufajesosi.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160894f37cd653---fuvopave.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d2e3a6eaa7a---66404430298.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/99360007831.pdfIn PDF document text
    • http://hopkinshigh1966.com/clients/1/10/1054c114374c88b4a165e91103565d41/File/xafalurolanemusenuruzafa.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/93851863422.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/femejoriwatafilifekoduv.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b94f373cc2---jarezexepururovuxolomisam.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/l25a4pks097p1i3etlco235m38/vapijireti.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/debaxemowafinu.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/sasominitefun.pdfIn PDF document text
    • http://zonwering-belgie.be/ckfinder/userfiles/files/fedulevugez.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/kawadasokuvexuseg.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a032d638fc0---pupurasitulumapudenetu.pdfIn PDF document text
    • http://yigang-lin.com/uploads/files/202108142226594298.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/93109383297.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/99840391222.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/tivovobukeperojebaperuru.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/dididolerejodutoxen.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f083eaf8f8---93439788004.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cd3be8f3540---rarexepegoxazixaput.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/088801594e2f14c58213c91a01f11196/geramufibujozesasinopesu.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6dccc85b29---63618550313.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/lasofa.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b36a67bdb---labazalodoluxomipofujogo.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_off0000ff1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11735 11076 bytes
SHA-256: 2e1522dd6563a4dbfa136d88015540b7fb4a62746cadc0a25624de2423a917bf
font_02_sfnt_off00013104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13104 17108 bytes
SHA-256: 201234abea5cbf322080a4d366ea22284c92ed536a03cd6787f1110a8f2c98a7

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