Malicious PDF — malware analysis report

Static analysis result for SHA-256 573cbf7f4448f2f2…

MALICIOUS

PDF

87.0 KB Created: 2021-07-25 13:08:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4fdb91756b93b8f9b886f8835cbac9df SHA-1: 6e2afb00becbd936c57258179bd6c540ddf52743 SHA-256: 573cbf7f4448f2f229f09dc645ec8aa593a725040a9c742404891235a17e7d81
156 Risk Score

Malware Insights

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

The PDF document contains a large number of links, many of which point to websites hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://avela.md/userfiles/file/544107703.pdf In PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609af26bec8b9---zuwatilajarirefufiba.pdfIn PDF document text
    • http://lagunarent.lt/ckfinder/userfiles/files/3110582687.pdfIn PDF document text
    • https://eurouniversal.eu/ckfinder/userfiles/files/tupiwimenoji.pdfIn PDF document text
    • http://teleserviciomalaga.com/ckfinder/userfiles/files/xulusaxitibazuru.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/75880394007.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160b58cb365e87---duzokajesafenobo.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cda39d4bb18---jokujepumavutibe.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/sujuxabagivaxazuluwo.pdfIn PDF document text
    • http://dzbnf.com/upload/file///46913953231.pdfIn PDF document text
    • https://superchills.com/userfiles/file/dukizimavuwuxugosin.pdfIn PDF document text
    • https://justbuymeds.net/userfiles/file/67569392678.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/wetodi.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/sinijojiweja.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/16095ae3fe1d57---luderezikobufix.pdfIn PDF document text
    • https://majubesar.info/contents//files/65049810709.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/bc2ee0b8d81e411cb70a3972382189f2/46225936501.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/8a3550cfef606d999d53e4a3a368c7df/widawono.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/44814152019.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/14562084693.pdfIn PDF document text
    • http://sutinlawkrabi.com/ckfinder/userfiles/files/gezuxibup.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cce246ce2c---82124402574.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8d2185901---59894699879.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/8ab61d9a95bab0dd1f525885b842ee88/vemezanajetajuzawisu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=army+ocie+guide+2018PDF 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_off0000efb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB1 10832 bytes
SHA-256: 40664b67ea0ab615105640c3aaa43f5a8b2f114c23c11d8c28003b6c810a95da
font_01_sfnt_off0001089a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089A 17568 bytes
SHA-256: cbdb761ab9a04f1cc6cc09728b0c619738c58ce255119c8bb1c9eb74b05b4cbb
font_02_sfnt_off00013696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13696 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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