Malicious PDF — malware analysis report

Static analysis result for SHA-256 98a753a8ecc350b2…

MALICIOUS

PDF

87.5 KB Created: 2021-09-14 10:14:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: acbeaa721119130293bf70ae9f39950d SHA-1: f5f90334cc51bbe02d0c9ab8acb10276d66cc0d6 SHA-256: 98a753a8ecc350b21da1d0c1f9cbd28147ab64e85d0728df691016eb5e9580d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms points towards an attempt to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crysiq.ru/uplcv?utm_term=pvp+android+games+2020 PDF link annotation
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/kalikavixesijiv.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1bf96011a---97838917851.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/pujixajexefifido.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/95680785045.pdfIn PDF document text
    • http://ltptech.vn/uploads/userfiles/file/fijigubapavoxeliw.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/80577756230.pdfIn PDF document text
    • http://karmakonnect.org/DrumiBhatt/karmakonnect.org/Final/ckeditorimage/files/67992118082.pdfIn PDF document text
    • http://identik.hu/editor_up/kuvapav.pdfIn PDF document text
    • http://ipayon.com/root/FCKeditor/file/30514783879.pdfIn PDF document text
    • http://abnicum.ru/files/file/babidasunosotuwezu.pdfIn PDF document text
    • https://incense888.com/uploads/files/202109111912124348.pdfIn PDF document text
    • https://justforjetscatering.com/userfiles/image/files/xixifefebinose.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/73930289978.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/mowubawuduwapo.pdfIn PDF document text
    • http://lehnerkom.de/images/uploaded/file/pofukoluneg.pdfIn PDF document text
    • https://jmclimatizacionhvac.cl/images/subidas/file/pitux.pdfIn PDF document text
    • https://fisheaglesafaris.net/pics/user/file/88454471806.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1614015c630189---madeju.pdfIn PDF document text
    • http://fruitsad.pl/images/file/64606049905.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd89919c14---nubivu.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/zubamanulimameva.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/78481450634.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/121441585.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/fetokaj.pdfIn PDF document text
    • http://www.examnotice.in/uploads/files/4941840711.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 10900 bytes
SHA-256: 01cac9c5fdac2e4c99e93cb409e0a26bd1e8bcb9f827ff8710d3692f7b5f269e
font_01_sfnt_off00010bd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD4 17072 bytes
SHA-256: a3bb06d44fcc021a40c41d5b6fb3a839da95a532b5aa017165f77f7ab3aa4f23
font_02_sfnt_off00013881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13881 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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