Malicious PDF — malware analysis report

Static analysis result for SHA-256 58a65dee88cb8898…

MALICIOUS

PDF

75.8 KB Created: 2021-09-17 17:04:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6bc4d9f47e180fc85161a22389604d67 SHA-1: 402945fbc6fe9abb46753711a518768062f14e22 SHA-256: 58a65dee88cb889878ce8b4fc0109d88d34f6e7d540dc4594fea4aca4ecc9579
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://drafthe.ru/uplcv?utm_term=lg+g4+android+version PDF link annotation
    • https://learningsolution.ca/userfiles/files/51137219027.pdfIn PDF document text
    • https://tivirtual.com/userfiles/file/bipejavuxezosawa.pdfIn PDF document text
    • http://khojedu.net/userfiles/file/livewafefo.pdfIn PDF document text
    • https://crcnueva.naturasoftware.com/uploads/images/files/44970758482.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/91225475348.pdfIn PDF document text
    • http://skncn.com/u/files/vitulidabim.pdfIn PDF document text
    • https://stauber.lt/images/files/43865267363.pdfIn PDF document text
    • http://partnercable.hu/files/14314135208.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/domavuzalevax.pdfIn PDF document text
    • https://www.vek-bg.com/app/templates/js/ckfinder/userfiles/files/pusukexexile.pdfIn PDF document text
    • http://baove24h.org/upload/files/gesuvubigegar.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140bdce01408---taniwipozifovesizugivim.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/0ae1da639912e6603a8b99f0a089fc2e/89148001100.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/pejurotoso.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/rofapovanukajazasobotiki.pdfIn PDF document text
    • http://taociren.com/upload/file/210909192126044293rikt5gy6mvi5.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/rikizujopu.pdfIn PDF document text
    • https://alariel.be/userfiles/file/gapixusobikufe.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/61258319192.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/d41b802ab4312b631b3e307bcc48b69a/5577769093.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-9-14/20210914152232221408.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/30761431313.pdfIn PDF document text
    • http://magdrywall.com/project-new/christianbook/upload_images/file/kamenapujamud.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF76 17388 bytes
SHA-256: c6b7f4a43bff7a1dc156739f1308d645ceda4608bce270d39af9a710fe55edd0
font_01_sfnt_off0000db8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8D 16368 bytes
SHA-256: 861ffeb428ca094850acd537f84b482313c4a57a85f5a5cb17cd245c1127cf54
font_02_sfnt_off0000f20b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20B 10380 bytes
SHA-256: ce336c5124b78ef62cc60fced700623bee106e3ab9cae44a465b48fc74edc5d0
font_03_sfnt_off00010978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10978 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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