Malicious PDF — malware analysis report

Static analysis result for SHA-256 e62f2204eacf20aa…

MALICIOUS

PDF

79.9 KB Created: 2021-09-08 04:32:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3eff52016f7e4889dad498cbdaf6f539 SHA-1: edae3766afd8856c7085b5082394898a166ed545 SHA-256: e62f2204eacf20aa537ba8b8b419cffb915fa4678e1ea5b10b0a75da2f685ec7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of external URIs and link farm heuristics points towards an attempt to redirect users to malicious sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://www.fangjin.org/ckfinder/userfiles/files/dijina.pdf In PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/90289560632.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d0ed7e6ba---35774065801.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/8c81587c94eb213c9bf0b9b8810eedd4/13969475239.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/57499343375.pdfIn PDF document text
    • http://soles2walk.cz/data/file/vetojedupu.pdfIn PDF document text
    • http://franklinbristerharveyfamily.com/clients/a/a8/a8910385c57dfddac3c6311e2bd1422e/File/vuxijezutufepimus.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/e11021f32c53c6272aab2d5c7e212897/vabatomapan.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/kuzasur.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/68969465517.pdfIn PDF document text
    • http://www.bandungmesin.com/file/64869788398.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/bg0kpldeh9uu8n9rci23ganatc/mepowatiteduf.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612cd55346b83---dezufukuvif.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/2jrua0hl0f0mq15qe25sc087k6/bunodega.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b092b8ebe4---81549219739.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/h8hq6sv9hg83qgssc1r50sbb3d/nukubonodexixipeni.pdfIn PDF document text
    • http://balbu.eu/uploads/news/file/magawikeb.pdfIn PDF document text
    • http://traviet36.com/upload/files/zatiwod.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/rutenel.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/4186226540.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/nanajatisidulufaluwuroki.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/64455535741.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=editing+tiff+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_off0000d6cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CC 9928 bytes
SHA-256: d831f74c32b4e92109091d3e79c8d22b0caaed99b9cb975c2b79726d4c75afa5
font_01_sfnt_off0000ec88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001049a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1049A 17456 bytes
SHA-256: b8e04f6deb2650bc5c086284e25317f21478f5aca32604917331b05ff85f292e