Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fbe7674ef9502a7…

MALICIOUS

PDF

87.0 KB Created: 2021-09-03 03:03:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 111987b070ab521d8f696d584f339561 SHA-1: 8e77226c6af9af67c348ad2b16a36067a2068f35 SHA-256: 7fbe7674ef9502a7364d48e790bec7e2f3e434b175dc96a2e30deb940ed3691c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. Heuristics indicate it functions as a link farm, pointing to multiple external URLs, some of which are hosted on potentially compromised WordPress sites. The embedded JavaScript and link farm structure suggest an attempt to redirect the user to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 7

  • 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.
  • 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 http://restauraceeverest.cz/userfiles/file/89184472814.pdf In PDF document text
    • https://kudamatsu.org/userfiles/file/12795493071.pdfIn PDF document text
    • https://peilimineko.com/userfiles/file/lavivimufo.pdfIn PDF document text
    • http://gordostcrista.ru/userfiles/file/rosumisomoxilokiwupupu.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/f86869cddc1eb7846409e7f957b3caf7/selulunodabiliwepik.pdfIn PDF document text
    • http://jar-ted.pl/file/28523150781.pdfIn PDF document text
    • http://rahwayhigh.com/clients/42761/File/povamagepowisipunuj.pdfIn PDF document text
    • https://bibonatura.hu/ckfinder/userfiles/files/69658529609.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/modinatolup.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/sutuxibesimisudizanaj.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100c4e24f169---josofodifanunubadikapi.pdfIn PDF document text
    • http://plusk-car.com/js/upload/files/24062384134.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b985e5dd473---xigetifajodav.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/fiwusabowazuv.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/s157kpeab7ip60sodvn7rqpunh/wixil.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/88691096431.pdfIn PDF document text
    • https://101doctor.com/uploads/ckfiles/files/60afedc88de99.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/saxapelavarusavu.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/12421310182.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/6rfavhsf45ng399c3oa05apsq7/67108290279.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad4635cf3e---96312259204.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=formal+education+in+nigeria+pdfPDF 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_off0000ee69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001067b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067B 18004 bytes
SHA-256: 3782a602b80b0c0cb30f58cc8ad641c91a81b3ca03848dc8f08da4c0c5dcfd3c
font_02_sfnt_off00013575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13575 10872 bytes
SHA-256: 25680a2ac7104d24cc495ed1d01d48f1bf8d347bbbf501e261e670d1bd02ed81

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