Malicious PDF — malware analysis report

Static analysis result for SHA-256 2279993edd158a3f…

MALICIOUS

PDF

78.3 KB Created: 2021-09-02 04:27:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c363e6e5e437a062e4f976801207d938 SHA-1: b2dfe961c30fbdfc5dbd75db2b200027644b65b8 SHA-256: 2279993edd158a3f8040303b4e4379382bab8c7c751ea2e695d951803ad33898
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous embedded URLs that point to various external websites, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating link farms on such sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO manipulation. No scripts were extracted, but the structure itself is indicative of a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://catamma.ru/uplcv?utm_term=what+was+the+purpose+of+the+justinian+code PDF link annotation
    • http://outspokenholland.com/userfiles/fckFile/20210807012754.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/jemetokewogixekulikip.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d20c372dfb9---fereluv.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a72a01e2bb2---fokav.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/ramijilefopuxetezipi.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5c312327e---63104816631.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/a51edd8472ea10cf097c7f34137c3cd0/6941214033.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/31305012518.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/pffnqs0q0p42mkc4bqma7mtlba/93747007188.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/13799956190.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/fasubagefuxoxolo.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086734e2daf9---51184754950.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/80fd0f2e34da292524e45e62e7398821/wasigulidubovigal.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/ronimosu.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/b2f9f3aa1285d213a50beaf7bc384388/11119787762.pdfIn PDF document text
    • https://www.tahitotfaluovodak.hu/ckfinder/userfiles/files/dupifobokigemefazap.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/44b3b0552beb01631ad1e30aeb884d1c/ravenetutetulo.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/fupo4sjkgn7dqa3mfn8a7sipi4/20853276402.pdfIn PDF document text
    • http://greenld.com/userfiles/mepexazasofanujedinudo.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/9bd1eca6bb361466e6271bbfaa8b1630/66147060041.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a599cb9d55514ac1febd0fbb8d6bf64a/netufikasetiwefe.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8af361d6e6---dafize.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a2cf4d1f95c---regol.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/kolejaxokisunufegexogiso.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_off0000cff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF8 10980 bytes
SHA-256: 598a71dfa1bf17049f0f51216c0f09b9e8211fd80026ec65353cab437a83ad34
font_01_sfnt_off0000e969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE969 16268 bytes
SHA-256: 51f2ec402318170caf365d78ab45c1ea693bdc65c1cee551d2fd22ba3931860c
font_02_sfnt_off00011314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11314 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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