Malicious PDF — malware analysis report

Static analysis result for SHA-256 c64339ff7ea1437c…

MALICIOUS

PDF

92.7 KB Created: 2021-06-26 19:48:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 89b5d06cdc9ae07180e6321626e3a1ae SHA-1: 2d862725dce6390a3c6306631ca29013b7a942ba SHA-256: c64339ff7ea1437c3299702fd4aef063a52fef2f90b19d17a4ec6b39611066e4
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or link-farming scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious content or phishing pages. No scripts were extracted, but the PDF structure itself is used to host and distribute links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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 https://crysiq.ru/uplcv?utm_term=how+to+wash+off+slime+from+clothes
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/6188a062271d3eb1cda5d77488881ac7/37324916395.pdf
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/742e70ada2d865b64e640f2b65da3b7a/59237095591.pdf
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d671f2f9b---49776838597.pdf
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16088dac39bb90---losimenegokomatelutiroz.pdf
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/1cff6b8044eea8ef9cec911cc6ece2ea/28506960574.pdf
    • http://www.jobsincrete.gr/images/_user_na/file/33914007503.pdf
    • http://feuerwehrobrigheim.de/upload/files/somedezojevuwadox.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983c6a7e5b0---64341988286.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/cc625d35be1d9469a1f27e39a295d55b/9748220546.pdf
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d14254ad2---42653218669.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c10bd500f6c---wopadolorupovamud.pdf
    • http://gibson100.com/clients/870224/File/jabew.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/pmn8eo5ihprk2f38cb3ch7vdjv/62419452142.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a0eb0e984---mosekenegamag.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd98f168b5---vadade.pdf
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/j594ijsi9e0d0gob0cdfp76u2j/xadaxovogewitowigoranaret.pdf
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/807713adb72e07189e8dea02ebfec636/66186762224.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607391ccb3c07---56370460569.pdf
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/3gk404jkme1gipbhb49abd102n/wijidik.pdf
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbf0424936---93759007335.pdf
    • https://upbilbao.com/ckfinder/userfiles/files/migeximepu.pdf
    • http://yonseri.org/userfiles/files/jedudederukusok.pdf
    • https://amitadevnani.com/userfiles/file/jitojesifusofemize.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd6b.bin
97a693020a9c67c913fa5abf5d83a61848c846aa130c5182d8e66f233602b60d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6B 2044 bytes
font_01_sfnt_off000106b5.bin
45785e1e346d5b6bcb96887752cb4b16692e1f3ec776166bd79538747a65d552		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106B5 17824 bytes
font_02_sfnt_off000134ef.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x134EF 16792 bytes
font_03_sfnt_off00014d06.bin
d0634a699235ddc59ee6440eaeae77bba0b4dc5a2cc36a5539d13f2931bdc7c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14D06 10576 bytes

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