Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aac97cecd949145…

MALICIOUS

PDF

89.9 KB Created: 2021-09-08 05:11:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ab64d20daba26610f987c44ffe170360 SHA-1: bdb6682f5003bd3f9a2b4b0c72945fa2dda78216 SHA-256: 4aac97cecd9491450266eb062fda36d077b623838ef3ed1eb2af05fa99dfa06a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable domains, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are consistent with techniques used to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pistant.ru/uplcv?utm_term=le+r%C3%A9alisme+d%C3%A9finition+pdf PDF link annotation
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109656a340cc---99832924593.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3ff9a281e---6103899926.pdfIn PDF document text
    • http://hoggard1975.com/clients/a/a4/a43fc1111b7ad4318f8b553feb79a890/File/lusaniluwide.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210818_63C28A396001FD8C.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/50758063328.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/b940004fbc40f5da79fc90578e35f629/24794523272.pdfIn PDF document text
    • http://dulichgiahy.com/upload/file/76516553018.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608515c151af3---49514836207.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/dufob.pdfIn PDF document text
    • https://ihappywash.com/uploads/files/202108190224519040.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/dtocnpidaqs5tf2heqt09icivg/65351875174.pdfIn PDF document text
    • http://cauthinh.com/luutru/files/mitajusopoja.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609256d1d0191---11899914868.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/7c019ce652b4f06b6009ff16a84c364f/48248692649.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160914aefb22cb---purumovawuviba.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085947b7eef2---tejuvugadis.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/96221220420.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/telesodifinajiberi.pdfIn PDF document text
    • http://hamdannepal.com/userfiles/file/58468287643.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/xilasuwivejepimet.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/73216073971.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/dafba605d6938698701ee85c463a2800/26323705556.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/giliwabopiwosuxom.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_off0000f315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF315 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B27 20764 bytes
SHA-256: 0274035b0d4c0534111575d4961b1dd78a24a74b7deeb9f77a757bf5e8eab28b
font_02_sfnt_off00013fd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FD2 10768 bytes
SHA-256: 41fa90f315f0d2d4d5139fad0e780b2a4a73c5ad79aba7b9217111c0b5f823b9

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