Malicious PDF — malware analysis report

Static analysis result for SHA-256 946604297668f7f2…

MALICIOUS

PDF

82.5 KB Created: 2021-09-16 05:12:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c6d02c72528999a7a3d9df2e4333328b SHA-1: bb9ecb8afdb22000aa7e138e3d3eeed58c5814e3 SHA-256: 946604297668f7f294378632ab53807ff709cbcfd74c2b8aacf006a86b8f04be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to external sites, many of which are hosted on compromised or disposable domains. The presence of 'utm_term' parameters suggests a phishing or SEO manipulation tactic to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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.
  • 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://medvor.ru/uplcv?utm_term=top+action+rpg+android PDF link annotation
    • http://greddy.com/admin/common/ckfinder/userfiles/File/33804793258.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/33126084570.pdfIn PDF document text
    • https://lockerova.eu/admin/upload/documents/tonirejuninunajibizenirit.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/36922192767.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613709e99e65f---7007291926.pdfIn PDF document text
    • http://webcertain.asia/contentupload/fckeditorUploads/organization_/file/85633375624.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/93321791300.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/gogatikofowikerikowivo.pdfIn PDF document text
    • http://borneneskontor-landsforening.dk/userfiles/file/kapijuwinu.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614219374bdc7---4926971750.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/79555092218.pdfIn PDF document text
    • http://janaturismointegrato.com/uploads/file/sajabuxanufi.pdfIn PDF document text
    • http://oldstat.ww.tj/img/file/72306634188.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210901205326.pdfIn PDF document text
    • https://artgallery.devctn.com/ckfinder/userfiles/files/wuxitiwepidapotak.pdfIn PDF document text
    • https://daks-96.com/f/uploads/files/43345446488.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161429bafe5516---nolawe.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/zimupibuz.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/mezabaxinizatewaji.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/1071670904.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/gibakumegez.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-6/20210906213236221908.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_off0000e000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE000 10304 bytes
SHA-256: fcd0accdb59f813b15fb2e530078456c34828cc2ad2e0abae8c843ec67dbd5de
font_01_sfnt_off0000f720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF720 17560 bytes
SHA-256: 2ff5fbb20d310483afc855e5f879a89fe3fb18b4a717efbc1b05a383578062bf
font_02_sfnt_off000124f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1