Malicious PDF — malware analysis report

Static analysis result for SHA-256 770f72f0adda5683…

MALICIOUS

PDF

74.7 KB Created: 2021-09-12 04:53:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ef66f3aa697781a6fef1199e98f57f00 SHA-1: 41e01c0a46cc8a4f8c728f2526480138cc3b2889 SHA-256: 770f72f0adda568360b4dc404ee44d6c505ab2e5df0cceb3e0faf323070dd372
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits multiple high-severity heuristics indicating malicious intent, including the presence of random and compromised CMS upload links. The ML classifier and ClamAV detection strongly suggest this is a phishing or malware distribution attempt. The embedded URLs likely lead to further stages of infection or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://krisoc.ru/uplcv?utm_term=roald+dahl+charlie+and+the+chocolate+factory+read+online PDF link annotation
    • http://hzqzg.com/d/files/wupekalavu.pdfIn PDF document text
    • http://athaj2.specialty-match.com/upload/files/fapefovubofudobididoko.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5ppd7vm0bigb0vinjeh7ff6e75/33219016606.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/kupinobubanofigixu.pdfIn PDF document text
    • https://alwaysthesame.pt/site/upload/file/mafawevuje.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/bogibikinifoxo.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/1v8oi5qr1j266060hc0g70h5k5/gobarituviwesigakupanuz.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/69987489267.pdfIn PDF document text
    • https://ezokniga.com/uploads/file/refunukagizob.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/12208280059.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/velonorepanazevefujafefew.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/jotevonevigesoditewasatef.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/m99cmfnkknbhppkn26faqak231/77608718192.pdfIn PDF document text
    • http://www.mediagrand.hu/data/editorfile/farizizamosakifisiroja.pdfIn PDF document text
    • http://maidichike.com/upload/files/somefarefudolu.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/vasemenaxevi.pdfIn PDF document text
    • http://pronobile.com/catalog/file/sofetubafebebojevomubusu.pdfIn PDF document text
    • https://kclandscapes.com/ckfinder/triplebuserfiles/file/domupoloxozina.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/d3866e06c20a826a770a0b13473bb1c0/87760192165.pdfIn PDF document text
    • http://fiorenzuolatrack.it/userfiles/files/21007977886.pdfIn PDF document text
    • https://www.edm-medical.net/ckfinder/userfiles/files/naromubono.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/65aeabcd215154e03ef439dc1fc77561/xedevawuveburavoj.pdfIn PDF document text
    • http://bamboomfi.com/htdocs/cljr/data/files/xejofazozedexa.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/novefavuxa.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/30806589212.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_off0000bf03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD715 17516 bytes
SHA-256: a66bb488ecc371d60845dd1201216852e8e2c29affdd7574994fe7797dadd8f1
font_02_sfnt_off0001048d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1048D 10564 bytes
SHA-256: 0979bc3782abb4ee2be8606fa5524da229e5fbf9618e85e8b8161ebffee73103

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