Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbcda7f4f7b84131…

MALICIOUS

PDF

75.4 KB Created: 2021-08-27 03:51:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f0b9425d608188e99d34c42ff6215834 SHA-1: e4e76861dc9e7430d96423f7b8b01c1869674fb1 SHA-256: bbcda7f4f7b84131131767cd4bd44d770759068ea5d949d27381045cb896463b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The presence of multiple compromised CMS upload links suggests a coordinated effort to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c82e93a9b0---13442855993.pdf In PDF document text
    • http://dagmar-e.de/userfiles/file/91123960238.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/6f8b550f9924f7d2bce8030bb0c1e8ba/ruratedusoxakalopanefoje.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/53284822143.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076effd7e7f4---62842200245.pdfIn PDF document text
    • https://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/47661ff767c1b3e6e03849bedc92be4a/42597276055.pdfIn PDF document text
    • http://allasclub.com/campannas/file/74152211263.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/43777095561.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/6dmf4f8kgv4f3oh9en57shg7h3/figuvu.pdfIn PDF document text
    • http://myshopekerala.com/userfiles/file/6766416871.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/285583639.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/11783492566.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210613_FC3072D6D23817E9.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/33569936668.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/4p8ekb7gbob4c0ccid643craqj/kuzet.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/c046270419e65d6969826633690241b1/mumeposafilufezi.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/2174766269.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/23736533781.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/28442384265.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/4444f4af67517bfa05c0ce5e7d383e3a/33798140399.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/janum.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/266ff1b80bcded3ff751ff960f6ee225/tazurad.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/67825049910.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5f288bd11---kidenukoganoti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=charlie+puth+one+call+away+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_off0000c2f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2F3 10776 bytes
SHA-256: 88aa182970805d89f881205b9fa380f3bfa24383351464cb38091850f9c441eb
font_01_sfnt_off0000dbbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBD 16960 bytes
SHA-256: 6a7e444ad44306a452a650b97a7ecce78c994a9a178d675610f0ceebf10da231
font_02_sfnt_off000106fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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