Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e599f5b0ff64b46…

MALICIOUS

PDF

76.4 KB Created: 2021-08-31 23:54:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: cb305b3e408c3b1489e87167d2a28b5e SHA-1: 115577ac19b5f1ec3120f8408e29f2cde860af33 SHA-256: 6e599f5b0ff64b46f81a29777e3fb4350470ce25c31b9b211a501cf45ca679b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the presence of external URIs and the link farm structure strongly indicate a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • 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://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2c270c0b4---nozavadodizunoxewike.pdf In PDF document text
    • http://savages.lu/imagesRTE/files/gimowezaruwuwutufin.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8439cc27bf---lutetasinexewe.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/5197959556.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16084a98817cb2---dedos.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/16712332658.pdfIn PDF document text
    • https://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/86910448036.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210727082227.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160effa250f199---jumiwenibakamade.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/bajisub.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f2a2b0761---sitepeso.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/kebuxovil.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/gawekulovowafores.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab73fab3b77---woxafo.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/pufowizilipexoso.pdfIn PDF document text
    • http://changju-hotel.com/CKEdit/upload/files/41208427494.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e4c99035af1---46529748971.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/32924504682.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607685284ea0c---bisomituzebalopenolakofub.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609109a6d3a7b---73879893901.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/lozikojefoxajusubugujur.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16089c8e1c0059---dadefasivapovakagonaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=dotnet+run+dll+with+argumentsPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC708 17016 bytes
SHA-256: 248e97024657724deb7d2f74cee5d6b0bad59df14a3eef2fe1e158bbe9d02052
font_01_sfnt_off0000f2e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E0 10884 bytes
SHA-256: 79a2cbc471b7b8ea4261b4830029ea8d318eb464a930edc7d801ea04abd838d6
font_02_sfnt_off00010bac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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