Malicious PDF — malware analysis report

Static analysis result for SHA-256 de0fdfb372b777bb…

MALICIOUS

PDF

72.5 KB Created: 2021-08-08 20:49:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fe8534263240ddfd55838af3f2f79c8b SHA-1: b4ebbcbe72ecac96171dc60794a40fe2a58bc1dc SHA-256: de0fdfb372b777bb38d63c0978d89ab82b39235783255d46a06a2e067dc341d8
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple disposable hosting domains, a common tactic for phishing and malware distribution. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to download a password-protected archive, a method used to bypass gateway security. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://extintoresorigen.com/images/editor/82568353222.pdf In PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/varp3qmoqr2l7amamkmo8pmg77/zezusotodusuno.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/witegojanotosokinilexoseg.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608145389e3e2---giseliku.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba90571bd38---64641746912.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/doselofadasila.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/mebexosa.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b207ece80---kukuwuwexabevanexaronojeb.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/miqenkhi4nufhtvmcqrpnb1asg/wilenozexuxawofezadaberi.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/pavadejuluzaboxabaz.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/3ur9arcqnb4l5od1ug8d81u06n/pezenukeginifisove.pdfIn PDF document text
    • http://fairmonteast1978.com/clients/71195/File/winabuxizusamekewododituj.pdfIn PDF document text
    • http://seventyfirstclassof69.com/clients/60772/File/73908290142.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1c5442a37---subuvixusedaxoledatixofu.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/82701377627.pdfIn PDF document text
    • http://olguanaokulu.com/upload/file/50484965538.pdfIn PDF document text
    • https://hgb.se/filer/file/kumakosele.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/puzirikivobixadusojiki.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/31864429293.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dae930a643---2436396277.pdfIn PDF document text
    • http://gaskinfamilyreunion.com/clients/b/b7/b798c9f9e2af69c3a5b950a06e4ade8e/File/nirerekixajevarikojutili.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/xesolarome.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d649c9004---67632524979.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=alcatel+lucent+desk+phone+default+passwordPDF 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_off0000ba8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d29c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD29C 15744 bytes
SHA-256: 4bfd624a3af4fc128db97ca5efd760628b36544a40d7224e39f14481db3b78d6
font_02_sfnt_off0000fb3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3F 10884 bytes
SHA-256: 2221f555cd5197b1ce2b2fba1ccc4ff4c9cd2da98cf7a52ff2775a18a4eb2b8f

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