Malicious PDF — malware analysis report

Static analysis result for SHA-256 977bdd28713ddae1…

MALICIOUS

PDF

74.7 KB Created: 2021-06-29 10:57:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dd76b2633119986aa67f128c2e1f6f5b SHA-1: 900474135c3deccb9401aea717387c7b06baddec SHA-256: 977bdd28713ddae13f3d1ca78e0314f2b1f6f5dd0078bfc6e96e019430991e6a
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The file's structure and numerous external links point towards an attempt to exploit user trust by directing them to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://copy2d.com/ftp/image/file/ganajatizoxunesusa.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/jdq3i4kocpnkvlnhdptam08b8p/jesusofatojapavotilapawen.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084e7779fc39---33140197559.pdf
    • http://sosnovgeo.ru/userfiles/file/ligesi.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c95d50cbb58---45390712076.pdf
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/c7884e32f92e6615ac029f6874384000/76305721579.pdf
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/wikoperunivi.pdf
    • https://argumentua.com/i/file/96745367461.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/eef2e99e8ba8e6ebe378188ae91396db/84314135840.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f4e33ce8d---99010735427.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/f9556365df2787793c0168d39883f1e6/vukidaj.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607676a44310e---feguju.pdf
    • https://bititechnika.com/uploads/file/31850917625.pdf
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/crpu8go6eri4mum0pi59445v2u/51486371693.pdf
    • http://apexibd.com/uploads/fck_uploads/file/gutulepusivubobig.pdf
    • http://ballarioarchitetti.eu/userfiles/files/55202903992.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607424bf27066---geminazexonerozesefujo.pdf
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/19f668cb7103182616ed2bdfadf4d829/80821252498.pdf
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/6a1339a06dedb7b4f79a69b87b7aaafb/kesavitibuwodeburupuxasur.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa6aba3b30---95024091243.pdf
    • http://ahlhy.com/uploads/file/012212531689.pdf
    • http://mcleod-bobbitt.com/clients/64742/File/64252414286.pdf
    • http://medicaldistri.com/ckfinder_files/files/remawisuwebugabekoturu.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160793c667146a---19363396531.pdf
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/611cf84358866de23b524812d79cd568/kijesaronidamuloxoxobi.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7f41196d0---fizimegikotasap.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=best+selling+cars+august+2020
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/2644d23e5138b2968a9fdd961cf4dcf4/65463006885.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c12b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC12B 16792 bytes
font_01_sfnt_off0000d93d.bin
6f43bc01ad5dcb89579a9f6ef2c55c6e861327475ecf3c16548113a53c6b7b49		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD93D 16592 bytes
font_02_sfnt_off000104a3.bin
942dcc1f93b93782084865a22057d1a047aa661d4a3bd37dcf321f3796a6acaa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104A3 10680 bytes

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