Malicious PDF — malware analysis report

Static analysis result for SHA-256 b08545fbce3d8b1c…

MALICIOUS

PDF

87.5 KB Created: 2021-08-17 10:59:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 083b86cd2429164d39ea8c65be4f91d0 SHA-1: f931205313f27c159ddaf62ade1b5c13bbcd8ba5 SHA-256: b08545fbce3d8b1c00e25da0cb8612c2d11ff8edcd6333168c0f23bb0974fb6c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous embedded URLs that point to other PDF files hosted on various websites, some of which appear to be compromised. The presence of multiple links and the nature of the hosting suggest an attempt to distribute malicious content or engage in SEO poisoning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/ttli76bbm4nk1rr6ldc0e65ul0/ditonijegorosozepil.pdf In PDF document text
    • https://ikitellirezistans.com/upload/files/vojelogineliganat.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/750aac6fe159f01b4d20a1a7b6048c01/vixopimebotarikuletofeka.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bb80c75aff3---wobukarimatopatibo.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210626232341_gxgv2g.pdfIn PDF document text
    • https://emmaushuis.org/pages/17640914344.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/76492473316.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/66948811049.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/8eea1aa9896c4e6392f7e2be7d130906/52285069593.pdfIn PDF document text
    • http://bigredclassof1960.com/clients/879476/File/kadikutafobi.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/27931119747.pdfIn PDF document text
    • http://interstyle.org/content/xuploadimages/file/17096183368.pdfIn PDF document text
    • https://cavalier-hundezucht.ch/userfiles/file/nebaniwape.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/1ebabe86d16e679f7db1c59aa5843b5b/50012195348.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/0c3876695c725541d0b1ab2a9d140197/tuzuzimipodege.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/70357656531.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/53991621489.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/remedugiletajineloma.pdfIn PDF document text
    • http://easttbirds88.com/clients/d/d7/d767393c090093bf18db16876c07b5c3/File/bofonixegozivaxaxig.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609cfa5e7b367---9690021299.pdfIn PDF document text
    • http://rcsiprojectracker.com/userfiles/files/18222634896.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/98284272610.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610712a71d5c5---18033007443.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/zofasesuwanixobadado.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=free+editable+rubber+stamp+template+psdPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFF 10544 bytes
SHA-256: 7c5fa815117481c335120c1b2ae87f8a712d61ba54b9d0887227f1e260759533
font_01_sfnt_off0000f4c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C7 17392 bytes
SHA-256: a0bffec1b8ff3e269a8d625189d901f837da7efb8c805b416ff7e08f382adf0c
font_02_sfnt_off0001225b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1225B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013a6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A6C 16080 bytes
SHA-256: c9fa871d706934500ba7362bcc2679cd089fe7f1d29a584b92b55675ed6be739

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