Malicious PDF — malware analysis report

Static analysis result for SHA-256 914c66cb09473ccd…

MALICIOUS

PDF

70.1 KB Created: 2021-09-26 01:08:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0a0c0ae91527e1a7bc7dc09b2f732b53 SHA-1: 9d4f93fc97c3be4704cdb0821f6b79a6bfa2ecc9 SHA-256: 914c66cb09473ccd2b90c3068fcb229c9571ae1c58e20dc1da0851ea284e41f9
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various websites, many of which appear to be compromised or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using such sites to host or link to malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://wastran.ru/uplcv?utm_term=uptodown+android+software PDF link annotation
    • https://epgeptech.hu/ckfinder/userfiles/files/vedesemudaxo.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7cff710f9---34606254314.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/94276775507.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/69473118215.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/gafibapoguboxakub.pdfIn PDF document text
    • http://vanlysecurity.vn/vanly/album/files/gidiwanunumi.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/87a2c92d56e9b2433f77f7bbe93d1c5c/gosokagivowadamizupexiko.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16133653361c84---16165999808.pdfIn PDF document text
    • https://rajakeempat.com/contents/files/8829664488.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/77322251246.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386b45a097b---18052850468.pdfIn PDF document text
    • https://lyna-garage.com/htdocs/cljr/data/files/76760879657.pdfIn PDF document text
    • http://faizleathergloves.com/userfiles/files/puvaw.pdfIn PDF document text
    • https://triyoga-tv.ru/userfiles/file/danewomivivolovasa.pdfIn PDF document text
    • https://servingltda.com/userfiles/file/fefexuje.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/16d7411e40af1060c68b86b904c4c08e/8964378042.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/27941202626.pdfIn PDF document text
    • http://phunphu.com/userfiles/file/guvalowivebel.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/fukezomo.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c947514daf---35050149636.pdfIn PDF document text
    • http://tatagz.com/uploadfile/files/55813969644.pdfIn PDF document text
    • https://superpart.com/files/75776213376.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/kubidinulirofimezinis.pdfIn PDF document text
    • http://kolbiko.com/images/uploads/file/ditawuxiniguzazu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB042 16016 bytes
SHA-256: bd9fafbb898ca8dd3e6ba99a0e009dc7b3d6a2275d5b5a735bb555b283b3ead7
font_01_sfnt_off0000d959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD959 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF170 10536 bytes
SHA-256: a2bb95ecfe65bf5577a9de81fa4158caaedfb3b041fdcbe291d9efedfb2a9226

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