Malicious PDF — malware analysis report

Static analysis result for SHA-256 80863cb2a893cc01…

MALICIOUS

PDF

90.3 KB Created: 2021-08-13 11:03:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 67aa11f6d3c9795d4bcc92c37360c6f9 SHA-1: fe5162d4cdf53c180118e595c68ad1dadef049ca SHA-256: 80863cb2a893cc01b240c6a6301585cc08c39691d49d8c6cff909755758dca2c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, likely to host malicious content or phishing pages. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for these links, suggesting an attempt to evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/5317e8cb53bd09130d0a5ddf85b95a24/97810438510.pdf In PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608808c5484fd---bavegixovizojotaz.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8cda081058---joritasujitivarifinuvax.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/c4cee40855265af600eae96e02b5c4d9/refawuragaditojixabixisur.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/zumobabugenokajun.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/77207890770.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/nuzafipasenif.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/jolinepolutajavezivagi.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160af26ffe86d1---60010991182.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/54187662888.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/14200788784.pdfIn PDF document text
    • https://rozgarnetwork.com/ckfinder/userfiles/files/45224497891.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/ea39769b19d1f6362e1b4f6e754e72af/53765711659.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/nipakezujubozapigoweb.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc00755bae---39879606972.pdfIn PDF document text
    • http://ucity69.com/clients/861769/File/2812307198.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/tepawel.pdfIn PDF document text
    • https://liftsystems.ro/LiftFiles/file/52260564147.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086096f18568---wimupotulepu.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/mukafesulapuzopariwe.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021081310022673499.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/10717217436.pdfIn PDF document text
    • http://ozari-ua.com/files/file/4132052147.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/20938293889.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/71906759562.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/pumipuwefaloda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=the+stash+plan+diet+reviewPDF 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_off0000fd90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000115a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A7 10484 bytes
SHA-256: fcd9e63f26d6c1f9c38b6fa2395011d5fa55a06be308f2861b267b2e3c7a3e38
font_02_sfnt_off00012d77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D77 17392 bytes
SHA-256: c21124d670917110bc10823b1c74a14df23b91796b11343fb07b9b2f1d2bbce5