Malicious PDF — malware analysis report

Static analysis result for SHA-256 f321f976f209fddf…

MALICIOUS

PDF

104.3 KB Created: 2021-09-07 20:52:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 4b8b32a53abf30ecbc2393373c0724d8 SHA-1: d78f9a1ad29644d13ebae7e3113e4aa3bb039ed9 SHA-256: f321f976f209fddf931f87049f6f746401eef724a1b276ab071b21a9df3406f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads, indicating a malicious intent to deceive users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://laborke.ru/uplcv?utm_term=cambridge+audio+minx+x300+manual PDF link annotation
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b29b5a0b1fd---31744356881.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/woxabadajofenerutanegi.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/xabulimavinulajemagu.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160986ec4226c2---60784949152.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/85d1b3b709852f2c9e4ad36b332c5853/mizalusedoberi.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16083910c3cee8---63137220119.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/30679062252.pdfIn PDF document text
    • http://sakra.sk/storage/file/5036122472.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/xiturivomafimadegemurojop.pdfIn PDF document text
    • http://monktonlionsclubkidscamp.com/clients/9/99/99b8b5517e5fb663501b7ee5137ebf55/File/genodebumerugojepiw.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/t7nncmbebpbl94u8det7uhue4u/xusinibovepevumo.pdfIn PDF document text
    • http://marty-triple-m.ch/inhalt/files/70058480406.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161053794026c0---86961974096.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609571e7d1cf0---33438153580.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/8864b511d6f92dbebea117166f578e98/demove.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210811030519.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160d028669648d---26769921948.pdfIn PDF document text
    • http://skkl.cn/filespath/files/20210905012156.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/zezalovelo.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16079b1e9cb39c---rivesuxufemamuvavunik.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/33231073202.pdfIn PDF document text
    • 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_off00012eae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EAE 19756 bytes
SHA-256: 42a87f8810c9c4ba223f284d91063c15268ccd4d93b96e6d881e5e0e5f1efea4
font_01_sfnt_off000161fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017a15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A15 10992 bytes
SHA-256: 45df85c3178aaa8d7c1349118aacdded6f09cf93c41e78a70f557e532a0cc12c

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