Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bd597d3a7439917…

MALICIOUS

PDF

93.9 KB Created: 2021-08-07 11:30:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e93f5241f62ae67f0d1d9ad30c1c44b6 SHA-1: a7bc96051117643ecebeb7c10a3b0a954077b110 SHA-256: 6bd597d3a743991757d6c0df6c14b0eee9ae4dff9ecd403a8e3c082f878173d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing trojan. The document acts as a link farm, directing users to download other PDFs from compromised WordPress sites, likely to deliver further malicious content. The presence of external URIs and link farm heuristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b571908b8bf---nuxid.pdf In PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160881b87709e7---42868405419.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/jaruvefarenoxifofetenupu.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/80818779958.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/42676776600.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/tezibovirepo.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/94d19601b9f2dfce563d4c10cae12243/87903492055.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/65184935836.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/94387436432.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/nh9e7jiirh5a34ki2qkbq3m846/susev.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/1ac5a4dcdf6bc77cb0609630993f8d6c/28898965657.pdfIn PDF document text
    • http://www.edgartownschool.org/uploads/files/11410465602.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/tugujuwebuvebigir.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/8rg5bhhtl107gfae2o6usl4q60/pajepiseb.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/88554859247.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/molebudixujudax.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/953e8488f34188337f89d0b30daf7dac/41201036733.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/lujel.pdfIn PDF document text
    • https://steammining.com/userfiles/file/16689057980.pdfIn PDF document text
    • http://palami.by/images/file/rezogixobikanuxulidexas.pdfIn PDF document text
    • http://cafemsoffice.com/userfiles/files/warakese.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f85e847f1---20103664512.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/sijezozu.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607726f0a3972---21335497362.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=professional+annual+report+template+word+free+downloadPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1A 10848 bytes
SHA-256: 89f513edd984447ab7fc0da3bb102337d06f84a40e89f0f2404f56c50d28774c
font_01_sfnt_off0001262c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1262C 16656 bytes
SHA-256: 64f976bb250b7fc52dfac9d563843df2db548db3b15ababafc5f83cf83ce18be
font_02_sfnt_off00015170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15170 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1