Malicious PDF — malware analysis report

Static analysis result for SHA-256 c77881dea097b6d0…

MALICIOUS

PDF

81.7 KB Created: 2021-09-07 23:02:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5b2b2b4ddb9ca983069510d1698f951c SHA-1: 50998d8c43d0914732cb3b7ab121e704920d8927 SHA-256: c77881dea097b6d03c7b4c5f79064f80cae9b9ff5cd24266f420c57edea750cb
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or spam distribution tool. The document contains a large number of external links, many hosted on compromised WordPress sites or disposable domains, suggesting its primary purpose is to act as a link farm. These links likely lead to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://cructi.ru/uplcv?utm_term=batch+convert+pdf+to+png+mac PDF link annotation
    • http://sutphinsgermanshepherds.com/clients/21958/File/50582785385.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/0f6af132d6682e7cb5281cfc8be02198/98362661268.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/luzusopadijese.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/aa615c0b57d5112da058a38aacd6fa5e/xusamedelizeko.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/11170555566.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/54211158650.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/16294729662105781922.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///86295443175.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/551af87e65d19f91748122617e488758/9350939586.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210710115832.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/0d7d2f044196ccfb626a7ce32248bd47/sisuvimajijog.pdfIn PDF document text
    • http://timebymtm.com/upload/files/30980005668.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/c970e1bc39cd46c88928c316057e048a/62751706007.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/ot74u6b69ndocjecptm26a2pb5/bonemedokeloniter.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/68f124ca8a5f083e5a11d63d8b211989/10735371306.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160709f349219c---vaxawuzan.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160cccb305310b---zilomo.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4f352645d---sakenavifivetojo.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/36352011058.pdfIn PDF document text
    • http://gachtrangtritranvinhtin.com/gachtrangtritranvinhtin/Images_upload/files/xusuxus.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/50595812748.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/66671743249.pdfIn PDF document text
    • https://tempatpasang.com/contents//files/65511132271.pdfIn PDF document text
    • http://bwc.lt/i/soxusuzixafogaxus.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_off0000d7c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C5 19076 bytes
SHA-256: 3d2fde385d40b91e690d8aac42f2eeccd507437b1fc19288d20dfea1091e2b39
font_01_sfnt_off00010852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10852 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12069 10880 bytes
SHA-256: af5a4bf6a72fbc92ab7029555a91265d97c522db67f4fb21019b7fd25b745b71

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