Malicious PDF — malware analysis report

Static analysis result for SHA-256 757c7fce1c4d5e83…

MALICIOUS

PDF

71.2 KB Created: 2021-09-01 20:08:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 30ba44c4e28bf60d5772e913779e4407 SHA-1: 29cbbb320c6b060eafb01b57b8b4360c2d38c135 SHA-256: 757c7fce1c4d5e83d79ad586aae8358348cd5ab3d3fc9c356704675237aca1b4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure with a screenshot overlay. It contains numerous embedded URLs pointing to various websites, many of which appear to be compromised WordPress installations or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF_URI heuristics indicates a strong focus on external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 71 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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=sea+of+thieves+download+android+apk PDF link annotation
    • http://xboxheerlen.nl/userfiles/file/korubupefidibajusedu.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/p379i20r678s7atjl2a26dmul4/towafowijevegalapulonisok.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-4-29/20210429133249786664.pdfIn PDF document text
    • http://paulsaperstein.com/userfiles/files/62168118275.pdfIn PDF document text
    • http://hopkins1983.com/clients/861771/File/kokikonujolutomanesuvupi.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/986811b4feacdf5a87404ab998398976/56091255977.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/6a0091ab998773ab861f1ec1d081c661/zobukedanigowaz.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/vokifegopudulijuga.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/kalovuloxixujidowogabero.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/knhmgr9ttioe1hrihtuvale542/81389549858.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/90434415199.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/tivorerosugigab.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca219646d3---junexomatakubopujunibox.pdfPDF link annotation
    • http://shiny-baby.com/fileimage/file/rutemomimigov.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607171fd1343a---posexaravad.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/bae00ab7a2dc9acceac0971f9e467ca0/fosisevopajax.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/96469877543.pdfIn PDF document text
    • http://dienmaythanglong.org/uploads/files/11624739254.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/suparararo.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/47251282692.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16076431c865c0---3876754726.pdfIn PDF document text
    • https://basisnomor.com/contents/files/tokibipewusevirifam.pdfIn PDF document text
    • https://taumed.kz/upload/2021/08files/210825235648444662u1gf3.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5df0faed4b---teluro.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160945c519854e---43176559341.pdfIn PDF document text
    • https://hgb.se/filer/file/piwivipojoxavon.pdfIn PDF document text
    • 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_off0000b857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB857 14088 bytes
SHA-256: eec5f43a107c9c2e4bed6517d1ceefc17b43a7e3b87262637d9df968ec26b4bd
font_01_sfnt_off0000db42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF359 10912 bytes
SHA-256: 7969c8b35472efb89b56696d68553205a4e1aa97fffb13740e8a18686ac99772

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