Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b8f47fff664c60f…

MALICIOUS

PDF

77.5 KB Created: 2021-06-27 01:50:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 35997312b4003f99364b3496b1dbad16 SHA-1: 3b19ec10fc065727e37fbd0de4d758eaafbb0004 SHA-256: 0b8f47fff664c60f8d556093038fa3c89c7c323713b6426a6415c73066024edf
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicative of a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or phishing pages. No scripts were extracted, but the primary attack pattern involves leveraging external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://oniceh.ru/uplcv?utm_term=how+to+change+orientation+on+pdf
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/b250c81d5534f7f899c58413666e7643/58407919083.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/b491da6abfab37d72d9a7eab082fc37c/96642541347.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2af60ecc5---wuvujipim.pdf
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/nenofawix.pdf
    • http://edu-family72.ru/content/images/uploads/file/49005044324.pdf
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/5353128d416ac5962c56cfeec4207564/46392618646.pdf
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa1c0553aa---17299107570.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f2196511e---75480332434.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16085174c64250---melolipesarowubulerup.pdf
    • http://csc0731.com/userfiles/file/20210617232816_9agtev.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16074c9f47c7c2---812023126.pdf
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/ck5k3sg9csbv13rsmqc9g2ei8p/12818664905.pdf
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/8467a792d6531e93ea931c4687f3af3a/mefevusubidizajerilufax.pdf
    • https://makanbanyak.net/contents//files/lujemadowuzazodojig.pdf
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/42214690ce70c49d1c404c24ad83f5ca/larulujaxokowefuwap.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606f553b10149---luzeja.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607e21019b6df---xugosalazidurasaji.pdf
    • http://fashionflutters.com/ckfinder/userfiles/files/fukusoluvi.pdf
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/6f055a2e1ab98005738684f2e5412e16/94322959013.pdf
    • http://techniq.ae/admin/uploadfiles/file/8184109811.pdf
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ce1abe734---rozuzumaledavisutevas.pdf
    • http://www.herbertvanderbrugghen.nl/draft/nasitivitituli.pdf
    • http://armanetti.com/images/dubiroj.pdf
    • http://guides2alpes.fr/uploads/file/midudifolomejodobotapuxi.pdf
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/a354f627eb0115ee524e36e5ea52192b/kapazodidufelipufal.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_off0000ccc2.bin
622837c469bb7ac84a0ffbbb0630237a276373b7a78d6347828917a077b8290a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC2 16744 bytes
font_01_sfnt_off0000f838.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF838 16792 bytes
font_02_sfnt_off0001104f.bin
6184800155f2697ade7b91000c4550013fb42393fecbaa27334e7dca6cfcbcaf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1104F 10760 bytes

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