Malicious PDF — malware analysis report

Static analysis result for SHA-256 d85287e57c584f0e…

MALICIOUS

PDF

80.4 KB Created: 2021-09-18 05:48:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d695c0ed5a3c79446c54312c06b030b3 SHA-1: 7481b83dd9bcce1dd7627cb674fbb0625f04fbce SHA-256: d85287e57c584f0e7abb38c3407d01535100d0eb6838ded9c58582171c03a469
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to compromised WordPress sites, indicating a likely attempt to redirect users to malicious content or phishing sites. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan. The presence of embedded JavaScript suggests it may be used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16140d46c2e232---18216529343.pdf In PDF document text
    • http://retrofotr.cz/files/file/48658243418.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/jomolurevemape.pdfIn PDF document text
    • http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/kinumijarezetaremadebefi.pdfIn PDF document text
    • http://kunbot.com/upload/files/50946059012.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/17641868459.pdfIn PDF document text
    • http://nabisori.com/userfiles/file/wetebogarozidovefubu.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-9-3/20210903225119896985.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/perujidax.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/90965158612.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/50358186461.pdfIn PDF document text
    • http://burbank.kopanramen.com/uploads/files/4855003039.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/52532867393.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131aeae154ff---64978199728.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/61799410186.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/uatanj7rup0fvc517hl52gd5eg/vakexopaxametololod.pdfIn PDF document text
    • http://ingore.cn/upload/files/vilewonumenidefiti.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/63978284597.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/17464607405.pdfIn PDF document text
    • http://globalsocialwlefaresummit.com/app/webroot/uploads/ckuploads/files/genibowe.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/85000649347.pdfIn PDF document text
    • http://mtegl.wsystem.sk/userfiles/files/53319807336.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ecbd2637d---temuki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=aplikasi+vpn+android+untuk+internet+gratisPDF 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_off0000d2a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eabe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABE 10808 bytes
SHA-256: bb3d7a21f8ee974a40549bba9bb81d72a6072582db312493c0e5ef41f9dc2821
font_02_sfnt_off000103a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A0 17972 bytes
SHA-256: 73222c3979717915d790747755d84c2772e0e326282665e9b7a6cb632ab8bf34

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