Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f770353c4da844a…

MALICIOUS

PDF

87.9 KB Created: 2021-09-05 01:09:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c1c52348f27b43686c518dd3a9415ecb SHA-1: b6e52804163c78a5e104db984346a99c041166b7 SHA-256: 4f770353c4da844abcff1fb17945991827d48d875b13dff603df705f861d8a7f
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous links, including one pointing to a raw IP address, suggesting it's designed to redirect users to potentially harmful sites. The presence of embedded JavaScript and the nature of the URLs strongly suggest an attempt to exploit vulnerabilities or deliver further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://burragebrothers.com/demo/jolie/beta/userfiles/files/makoxuroxurijesavewaj.pdf In PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/90857678052.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a20a6d6f122---lafawoxelerezazapufoxebof.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/74188768065.pdfIn PDF document text
    • https://razredna-nastava.net/files/lafuxajakumo.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/74a77032eab147ab51832790c9eb44be/ralep.pdfIn PDF document text
    • http://phongthuydotho.vn/upload/files/lepatuzararag.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f17ec0e16---81404206864.pdfPDF link annotation
    • http://pphu-joanna.pl/fckpliki/file/xuriruponigakale.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/jonujok.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/agq42m3hrblfpssrpbl96cq1i4/pozexuladegebasa.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/55533140178.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed54f6e3fc---680481136.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/58552789210.pdfIn PDF document text
    • https://medtek.vn/storage/file/zipagoporivusofat.pdfIn PDF document text
    • http://hk-keber.de/images/file/pomigewasarofoxiruzifof.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/tegosuboj.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/zisani.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/c9cf9ab63decd1bfc8f2ae1ca46187de/22685538927.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/tiluzo.pdfIn PDF document text
    • http://sea-cruise.ru/ckfinder/userfiles/files/mutid.pdfIn PDF document text
    • http://alptw.com/images/files/gejalimiri.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/axamasutaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=definition+of+scientific+research+pdfPDF 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_off0000f339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF339 18064 bytes
SHA-256: d54a0aac14209bad4929899c640951ee2c54b686984ec68fe2919abf1c669fa8
font_01_sfnt_off00012185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12185 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001399c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1399C 10672 bytes
SHA-256: a483eb61daa80980367cdb1f3a7f6ba9db1a550b9e7b520f35a324050767f639

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