Malicious PDF — malware analysis report

Static analysis result for SHA-256 83ec99a4b977bf72…

MALICIOUS

PDF

80.9 KB Created: 2021-09-13 17:09:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 978dccfa1b67f0e1125c1471cbfa6154 SHA-1: 9604df4b144c25505d816ec605c8eccf7eaf1013 SHA-256: 83ec99a4b977bf72f96636bc79c05156ba94fef0dd288423b41d28dfb16516b0
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as containing a link farm and pointing to compromised CMS uploads, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly support its malicious nature. While no scripts were extracted, the presence of numerous external links, many on disposable hosting, suggests the primary function is to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://restavracia02.com/userfiles/file/xesudubof.pdf In PDF document text
    • http://hotelniagararimini.eu/userfiles/files/genojufiposifabexikodadug.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a660271b9---79522373290.pdfIn PDF document text
    • http://tnshoppingbag.com/upfiles/file/xetor.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/92050061743.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/34171658322.pdfIn PDF document text
    • http://vino-charlie.cz/userfiles/file/sivesogol.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/tajotipizonebafu.pdfIn PDF document text
    • http://ih-consultant.com/ckfinder/userfiles/files/22199523276.pdfIn PDF document text
    • http://kangshi-you.com/uploads/files/202109052314231581.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/6b218a781160c93a71f474823c2eadef/86429926309.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/tuzimidupifa.pdfIn PDF document text
    • http://tianlanip.com/filespath/files/20210911185824.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363b1d83238---96338020723.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/19139834968.pdfIn PDF document text
    • http://zjnep.com/ckeditor/ckfinder/userfiles/files/97601939867.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139bc4390c4e---86406587630.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/5265554173.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/6bb50ec5cb6e3e4e720f9a05db98688f/taxemajadoko.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/gtp6fgu1mmcde9b1kou4b7p6si/nigibota.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613668fe4c0e9---luresanek.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/49885521153.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=sims+unlimited+money+iosPDF 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_off0000d880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD880 10436 bytes
SHA-256: 206a8ba381fb12519370de172c42d3fd6317109ed67b944464bf536700703c3f
font_01_sfnt_off0000f021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF021 17892 bytes
SHA-256: b3a0965932c6135e9ef1c309d96251416ef663320be0ec7112582ebf30bcdf08
font_02_sfnt_off00011e2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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