Malicious PDF — malware analysis report

Static analysis result for SHA-256 87d745214a3e38a5…

MALICIOUS

PDF

82.3 KB Created: 2021-09-01 00:01:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4458c5efb9964babb6eace452c620de5 SHA-1: 0cbc7734673f79e4a6b459a58cc6a0ff9186f16a SHA-256: 87d745214a3e38a5f06cf8de24b42bc14746db89dc0db380d58f454b0d580f48
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

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://smidgel.ru/uplcv?utm_term=bamboo+forest+seed+minecraft PDF link annotation
    • http://esistore.de/userfiles/file/43503090189.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/jtm8u9jm4o8fqfi31unc9sdlhb/bewotodatusamupuru.pdfIn PDF document text
    • https://armandofalconi.net/userfiles/file/wijolamugitizetemi.pdfIn PDF document text
    • https://brincandoeaprendendo.com/fotosempresa//files/gilofe.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/nisapem.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9cf3233f9---59654987493.pdfIn PDF document text
    • http://acquadiqualita.it/ckfinder/userfiles/files/debikiduxeta.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/6uh2neoqv59g5ka259m7a33jiv/53598209722.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/10918431460.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/9gemq5on43ca15p7ib9bv4btsh/nirudizolaz.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/kijuporokotutedurazo.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160f1f287d79fb---9924080158.pdfIn PDF document text
    • http://dulichgiahy.com/upload/file/vamedezamisunuripudot.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/446ceec72ca95cb1816be27cd14c9f1b/98172567913.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746cc80acd5---xobuwoloxepubeji.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/dozigidu.pdfIn PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/sureberibokifi.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/80372461205.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/lemokikabuxufidalabeda.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/48476457293.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/34311363342.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/48019559914.pdfIn PDF document text
    • http://kantoromega.pl/userfiles/file/2136075940.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102d97883b42---tomaveletolinawukom.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_off0000dd60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD60 10784 bytes
SHA-256: 62cdd462f0ecb8920a9c7a478d43d345d2c3d2f543314d214e96a23d5550e27c
font_01_sfnt_off0000f63e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E50 17220 bytes
SHA-256: 84c541072953b52283526aafb3bf73426f5d4645d198ec37157794a2dfc4d534

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