Malicious PDF — malware analysis report

Static analysis result for SHA-256 1810da48cf2e61e7…

MALICIOUS

PDF

80.8 KB Created: 2021-05-30 12:53:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 9bdf1eeae208d836c5b40afa59b8df5f SHA-1: ced8258567f559883d3d3afddc24f6d3cb1df740 SHA-256: 1810da48cf2e61e74f051cf5bcf4cf75a13b64dff614ee5235ba633813f6590c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ketchas.ru/uplcv?utm_term=joker+suicide+squad+songs+mp3+download+free+320kbps PDF link annotation
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/ae32a8f4267904435f35db4a9752e125/xodirugikaxifel.pdfIn PDF document text
    • http://mega.kz/media/upload/files/wofuribagu.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/q0h30ho4j09m45s2qpi8o3932m/40762558745.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160762069d870f---27300170488.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/g2u5qsk68lpfr0p272p0mut6b6/75999262409.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16098b2b503884---437160677.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f808443423---75490877735.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f43ca298b---nabudekapovafegezogun.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16090020587a2c---zukojomomosobalur.pdfIn PDF document text
    • http://prattsofdouds.com/clients/d/d8/d85aab9f4bcbae69c8358f7a9990a0b1/File/vaxos.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608401686a414---migebaziboxesuximosiw.pdfIn PDF document text
    • http://vodnik48.ru/content/file/widisunepunuroda.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/2gv8qs7efkdo85vq5b79vvbkj4/wipajaxovuk.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa5e618802---nijojujojar.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/hfil9e1rqt1isf9camfkbco3f7/11275116287.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9688429b5---gevenavazepalijefe.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/pecdughspm7hfpevb7occ8v372/70250886758.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn 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_off0000d83f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83F 3080 bytes
SHA-256: a1fd080eb9a80edd8250de87ca0c003daee2fac7587f36c0e7754af12687fd7b
font_01_sfnt_off0000e33b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33B 6324 bytes
SHA-256: 6d290e96877f2c1b5e923d56b48d14c64421f6b1024aabcde2fbd5748820c154
font_02_sfnt_off0000f8b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B7 11556 bytes
SHA-256: ff1535e3712fb028bbaf3ca1d4a914f45f34236a5161625328cded7aaf5bdc66
font_03_sfnt_off00011ffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFA 16132 bytes
SHA-256: 29a60492f44b39d68fa00197234d6df9a0cf581d74754725da64c153577ac146

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