Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1fad55e85673294…

MALICIOUS

PDF

84.1 KB Created: 2021-09-19 06:13:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7fda023944fe19e11943da01e8955c97 SHA-1: 39a0619ec03a0c2ab4a9380c5718a84308ffb67a SHA-256: f1fad55e85673294c723a8bc8410c64723fa1e7cfa8415320944f068997dad53
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated maliciousness. It contains a large number of external links, many pointing to compromised or disposable domains, suggesting a link farm designed to lure users to malicious content. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://jfava.gemwareserp.com/userfiles/file/99924887782.pdf In PDF document text
    • http://donovaly-ubytovanie-safran.sk/web/userfiles/file/wizivajajitojajosuwidofe.pdfIn PDF document text
    • http://normel.org/files/upload/file/70528438814.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/tademobilipog.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161334f42299ec---11776081382.pdfIn PDF document text
    • https://ms01bet.com/contents/files/56622010613.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613f26e4f1eff---24574122622.pdfIn PDF document text
    • https://eko-briketes.lv/userfiles/files/80847121025.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/xasizexopan.pdfIn PDF document text
    • http://ohadalegistrocbarter.com/ckeditor/uploads/files/91211086092.pdfIn PDF document text
    • http://aaas.handyfriendship.com/upload/files/wokakimejaferizeniga.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/jamizigar.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e045fd89c2---23160746857.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/99801614280.pdfIn PDF document text
    • http://joomlacode.org/fckeditor/editor/filemanager/img.php?file=file/56704262687.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/85939689685.pdfIn PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/90758769445.pdfIn PDF document text
    • http://www.horakgolf.cz/ckfinder/userfiles/files/39581982466.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/60895200033.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/sijepanakaxavu.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/tumawofirojax.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/lagidedoveketaremolupa.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/disedoxonetorivavobe.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/pejozelawinik.pdfIn PDF document text
    • https://12shio1.com/contents/files/13699790635.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/zitosaju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=t%C3%A9l%C3%A9charger+les+jeux+gratuit+androidPDF link annotation
    • 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_off0000dc93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC93 19468 bytes
SHA-256: 6b43faeb8b55d59ce65f0c96768b2599010d4a15a566758859fe603be52a27d4
font_01_sfnt_off00010e93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E93 11100 bytes
SHA-256: ea768a4d2b0e69fad283c79e8ae3f9f03ae57d223693ff8e231824d605b347e7
font_02_sfnt_off000127ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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