Malicious PDF — malware analysis report

Static analysis result for SHA-256 b83e58c4714f9157…

MALICIOUS

PDF

92.1 KB Created: 2021-06-27 20:45:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7187150429afd88c210d1180219befa9 SHA-1: 9c77998ac861d1297fcc99390b3b23edf519403e SHA-256: b83e58c4714f915779eace9fb81b3fc139dca1234fd77f0bff22f9b288bd2669
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms strongly suggests an attempt to lure users to external sites for further exploitation.

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 https://archism.ru/uplcv?utm_term=best+place+for+job+in+world
    • http://dienmaythanglong.org/uploads/files/bilomurinezovikedajegawa.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607fed776c39d---vetufokotizudide.pdf
    • https://bushregenerators.biz/userfiles/files/zuzuwefikararegoxo.pdf
    • https://menu2uplus.com/images/file/71294844667.pdf
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b4cfc8ec4---44749298714.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ac2a0e584---66547662063.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16071cb6220345---xukisezufewufibedovowepas.pdf
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pirikunediwefogot.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c50597715a3---jonegob.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943cd62b4ef---tutujibagijelukemavib.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160b555af9bf1b---neravedupepesume.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdc7e2e556---99381314508.pdf
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/liturodasimenuludod.pdf
    • http://brightwayconsultancyservices.com/userfiles/file/81502044356.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/954611df80b9df8ae63ca7bbfe97c5a1/fejobadavogisanojidubo.pdf
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/midovotibowasudir.pdf
    • http://emotionpicturesfestival.gr/userfiles/file/65688796262.pdf
    • http://castrolmintabolt.hu/images/upload/file/winatigonowe.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/i25k434unqm43pe608ks003sr4/kuxorikalofigexuposesan.pdf
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/b48ho2h1mms576e8tnr5fn8j8c/13631341486.pdf
    • http://tsrmmessina.it/userfiles/files/wekepurebexu.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609625044d9a5---90694019249.pdf
    • http://aj-logistics.com/stock/userfiles/file/70523690432.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160765b356ae50---78971836803.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_off0001047d.bin
3448c1539ebcaf1356e30441b239b9acaa5e64298ddb364828a2e402163b2c96		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1047D 16940 bytes
font_01_sfnt_off0001300e.bin
05aa1f6a39d81e961413e34343d206e65959b68bdf0c52bd40ee69b96effa04f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1300E 11020 bytes
font_02_sfnt_off000149a5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x149A5 16792 bytes

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