Malicious PDF — malware analysis report

Static analysis result for SHA-256 d98721a1d5236397…

MALICIOUS

PDF

73.2 KB Created: 2021-07-24 10:04:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c205556bcc11d5a93246416b8d231078 SHA-1: 4f48961db732d5ace33a1a120c63fd7ddf5938e5 SHA-256: d98721a1d52363970dcf57dd56ac0de91e234a0fee051eafb52605df69556bb6
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by both a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories, suggesting an attempt to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating a tactic to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://voyagerf.ru/wp-content/plugins/super-forms/uploads/php/files/76cf6308b5e71ff5c2aa625fb287063e/88505206321.pdf In PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/83c2e400885c95c2d2f9f461b3eaaf31/sikoleduzobav.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf1feb5c5e---wugixapon.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160960a7719d7a---65623019871.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084897eac3df---tegepikavilufog.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160910ad24fcca---taketawujukakoreze.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607121c08386d---xedafifujipof.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/a69b40b7b49afc58c9ccf5471ae1bca3/fokubudanig.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/rexedisiguson.pdfIn PDF document text
    • http://446888.top/userfiles/file/33614972648.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f85c3c255---12608445570.pdfIn PDF document text
    • https://medtek.vn/storage/file/texowutit.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/82790439453.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/pebavuwanatixiduniwuxi.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/00745f37651867128649c002aea7635e/86026207897.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/8433ba5569030b06b3f8c00b73812191/rezuzonodoviwapiwukuwuxim.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a43010e34.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/lanenasevufemuz.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608c738ae5850---musubo.pdfIn PDF document text
    • http://peak-experience-japan.com/jumaxipesirojugapewupixe.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/8894614857.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/koliti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=what+times+what+is+111PDF 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_off0000c09b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC09B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B2 10136 bytes
SHA-256: 724984ad1e9f092ee14d1f841de0184146c64c120c5e9bcdc5e43e552a23e183
font_02_sfnt_off0000ef76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF76 15388 bytes
SHA-256: 9b694fad948ea006ef7b51f19255a88c6db26d65ef391944d85fa48253c5e4bb

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