Malicious PDF — malware analysis report

Static analysis result for SHA-256 c56bc9e137dbfed6…

MALICIOUS

PDF

94.0 KB Created: 2021-07-18 18:12:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3e5828a9f07bc5e48ae5c0f1e8616061 SHA-1: 27dbbd31b58b79ac0290267d2b5e55afdc369abe SHA-256: c56bc9e137dbfed60881a91ece362598dacc9468e79cb218cf6621672b188dbe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to compromised WordPress sites, which in turn host further PDF files. This suggests a multi-stage attack, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160bcd65e10815---96117430339.pdf In PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d54feed9ed---38475420218.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/21476793934.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/90410343923.pdfIn PDF document text
    • http://wearefamilypalestine.com/clients/3/3b/3bc38fc23f9ffb54b20226cbd6ad6ce3/File/jamuno.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/25354509492.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0718/5764aecd33d0e7a9a370ee4a1dcb8094.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b99070567ca---77928777182.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071dc80c9e12---50338410153.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160824005e1880---fanimebisobujumiz.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2c100775b---75391503222.pdfIn PDF document text
    • http://cycling-software.com/files/file/tozagewi.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210624_F820B070D9B183E7.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/3e0f44fd8c781e064269fb595bff0201/55434383135.pdfIn PDF document text
    • http://lyshiying.com/d/files/vixumabudef.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/48482952843.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/0aa6b81b359a48e469619bc466393c62/xusokafanijinoje.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/28771711061.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/ce9eef964fb750406b4b7bb49d4b9ed5/7223175872.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/78248838426.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/juloxokowaka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=electrolysis+of+aqueous+solutionsPDF 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_off0000f29e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29E 10672 bytes
SHA-256: f04f1b43263f461a075a3c0bbbe5dccdb58d8e449570d54073d7f25bff4e20c4
font_01_sfnt_off00010b3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3D 16488 bytes
SHA-256: d0e02ea597b059e12c640018e4c0b859d2fbe31b167f59dc9fd0dc6423c65742
font_02_sfnt_off00012225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12225 17556 bytes
SHA-256: d240a72bb6c922b6def989672bc105831784107bbd0da6bc0b87de02f58c7c09
font_03_sfnt_off00015099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15099 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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