Malicious PDF — malware analysis report

Static analysis result for SHA-256 69526b007fbbf710…

MALICIOUS

PDF

72.8 KB Created: 2021-09-18 03:23:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 43e484ca9fc9d8e47c1b3cd417f2add3 SHA-1: 63b11a28fd352e5dd5cbb9cddaf46793d23af599 SHA-256: 69526b007fbbf7107231900e0d7703dd8787ded58fa2855c124bd38b93bf00fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of many unknown URLs suggest a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection further support its malicious nature, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://lonniestireandauto.com/nbloom/fckuploads/file/turajov.pdf In PDF document text
    • http://adec-interiors.net/Uploads/file/kujij.pdfIn PDF document text
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/76291736829.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/dubelesovosufoxupid.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/50003407995.pdfIn PDF document text
    • http://szerecsen.hu/editor_up/vajelajufukefatureluvede.pdfIn PDF document text
    • https://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/53532137228.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/64492046ed4fe26e82d42051e41e0294/67967408133.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dfc95e7170---paditidibuvivojawiwonas.pdfIn PDF document text
    • http://pactolous.hu/upload/file/pulilapekutikojarexutaj.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/69703024173.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/duramapudipibumopoxix.pdfIn PDF document text
    • http://apsons.eu/files/file/memutilelapumesi.pdfIn PDF document text
    • http://adasbruiloften.nl/userfiles/file/76255910755.pdfIn PDF document text
    • https://speak82.com/_UploadFile/Images/file/82841162859.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16133cd2271a2f---56279430131.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/161403c8743712---95207383055.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/rezajesufimazofetarow.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog/file/59773433010.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/zaxepevudanajovapi.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/56163617238.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/5624264393.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/55142718049.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614455149476d---52261168583.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/9218661c86faaff54a5b457210deb1d3/92509353141.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/xanonikufi.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/kodidokomuginapabopujugo.pdfIn PDF document text
    • http://stylowa-pss.pl/userfiles/file/vivoxuvosivosala.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=among+us+12.9+apkPDF 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_off0000b98a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB98A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A1 10708 bytes
SHA-256: 0fd853db5affe69a7772b5a869ae3b3f006d8bdc994e2a0407a0993dc5babede
font_02_sfnt_off0000ea5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5C 16896 bytes
SHA-256: 6895e9f000f40be49e55522e1428020c1570384ecf97002fc9928f7526124bf2

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