Malicious PDF — malware analysis report

Static analysis result for SHA-256 82e1bf860ad37271…

MALICIOUS

PDF

88.9 KB Created: 2021-07-14 04:12:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: fad49e43b326b1fe7f7a08f6eec4b33d SHA-1: 87f59373a22ef0c8f0611bdd984de40425689c75 SHA-256: 82e1bf860ad37271ca9b8434acb200c97ef12e58d31ff065bc1d1da963ad42da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites. These sites, in turn, host other PDFs, suggesting a multi-stage distribution or phishing campaign. The presence of multiple distinct hosts and the use of formcraft plugin uploads indicate an attempt to obscure the true origin and destination of the malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae282986639---86541118352.pdf In PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/a55bfef821a21ffc713f1708a06a8d0a/likanozowofepiluf.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b312750cbd1---pozetirigojodo.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b463b29c56---wotirepikodapipakuv.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc5eef4ab54---43444968796.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/jugisazixulivegiti.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8a9a0c8c90---3789237525.pdfIn PDF document text
    • http://smeclassof1987reunion.com/clients/37165/File/ralawipojowobigumigawi.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/d7c44b65227c54cde6184c47ca4e7f37/modifab.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/d783703992b08b73ac6943afee131c2d/zirabilatora.pdfIn PDF document text
    • http://cosmic-kino.ru/sadm_files/pirevizun.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/vavagifuzujovuk.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/63595729547.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/792a8fa715a54b8aade79e28e2ba183f/ketozobupoxuvi.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/rekabane.pdfIn PDF document text
    • http://huiking.cn/uploads/file/150528097112.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16090cac407f30---12504346358.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160931cb823865---24960132299.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a33fc877c97---80360222489.pdfIn PDF document text
    • http://foodchemsino.com/d/files/fumejirodawibogopo.pdfIn PDF document text
    • https://kawanmto.com/contents//files/36638076305.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/04e56487d76a445bd73e310336be5191/wogevavuguxibudarorawo.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-13/20210513224258957186.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083beaf5dec2---niserugul.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/96695606165.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=daniel+and+the+lions+den+biblePDF 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_off0000f7c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C0 10388 bytes
SHA-256: 7e69281ebc51672aed66591acfc85e3b1e1ec86f858856edf64ef472bd3fd434
font_01_sfnt_off00010f25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12737 17344 bytes
SHA-256: 6346d43ad67b780a60eff3c4a86d87ae0f8da4b91109b5da3554b9d924d9cd76

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