Malicious PDF — malware analysis report

Static analysis result for SHA-256 107c51deb317f199…

MALICIOUS

PDF

88.6 KB Created: 2021-09-21 05:45:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 75537f5c92d79debf24f9c2afa25ffbc SHA-1: 4b4d72464326f053221e8460889be0610dd17e3e SHA-256: 107c51deb317f199d21848cb6091c3a1471c18ba49f086931e15b81bf38d76be
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to distribute phishing content or malware. The ClamAV detection and ML classifier further confirm its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 https://coretry.ru/uplcv?utm_term=the+most+popular+game+in+2021 PDF link annotation
    • https://avigailpekelman.com/sites/default/files/file/wepukafigimexipetipodu.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/161468aa31004b---9791173893.pdfIn PDF document text
    • http://internet-trade.eu/UserFiles/file/63721614247.pdfIn PDF document text
    • https://lemarko.com/userfiles/file/57216072699.pdfIn PDF document text
    • http://jcpingie.be/public/files/wuvosepegisojawadozada.pdfIn PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/88942314435.pdfIn PDF document text
    • http://48bulls.com/js/upload/files/7702355167.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/pizuvevolovunavoxadusezon.pdfIn PDF document text
    • http://merklink.nl/site/data/ws/files/74538325278.pdfIn PDF document text
    • http://itcbeautytrainingschool.com/userfiles/file/lutofaduretelojaxakulol.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/napiwufuf.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/37229644804.pdfIn PDF document text
    • https://holcom-wd.com/webroot/img/files/puworufenewosuvo.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16140a2717d045---kivixuzasofuwob.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/dexipokoxigevametidagek.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/09d1nbhmc69n7vin675msv6odr/45406038640.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/jopapenupej.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/sigajesofekibetiw.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/xutamuxakikozafuket.pdfIn PDF document text
    • http://btsoft.vn/uploads/files/najesadojemolaxovasusono.pdfIn PDF document text
    • http://koutingchina.com/upload/files/84985050626.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/matalikumukedumilob.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/52721292049.pdfIn PDF document text
    • http://novelinternationalschool.com/ckfinder/userfiles/files/87343119295.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/wetopupemilobepolexana.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_off0000f2da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DA 18588 bytes
SHA-256: 15d8d0bc6fdf1dec5497581411c574970be45bf0a223bbf8e1a1c9f09fa3b402
font_01_sfnt_off0001233f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1233F 11056 bytes
SHA-256: d16f9a78067a18902834b09ee3a2ae9c3fbfe9deb16e9fb62cd85e8dd95c37a0
font_02_sfnt_off00013cdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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