Malicious PDF — malware analysis report

Static analysis result for SHA-256 640f214fb5c47265…

MALICIOUS

PDF

70.6 KB Created: 2021-09-09 09:29:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 022e094bff1711d2eb00fc08da6a710b SHA-1: 4a45a03eecde563860f3223c643263bf4b9b2225 SHA-256: 640f214fb5c47265025690b4afbea8321eeef59eb97ed15bfecbad3515ea61ac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to distribute further malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics confirms this behavior. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

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://synerhu.ru/uplcv?utm_term=cast+phone+screen+to+chromecast PDF link annotation
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613833fdcbda7---24985959975.pdfIn PDF document text
    • http://awfiowv.love-mrt.com/upload/files/55250624968.pdfIn PDF document text
    • https://aathichudi.org/userfiles/file/39225161438.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/71472479289.pdfIn PDF document text
    • http://aktasmatbaacilik.com/resimlerfiles/35029316296.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/xukoradomasadilowoji.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/96755743727.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/16297342574.pdfIn PDF document text
    • http://edumedcare.pl/upload/files/fevumevuroxubazita.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/bugigaverivizekis.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/sazuramaturokumovumo.pdfIn PDF document text
    • https://mkontroll.hu/File/mozuxuj.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/72861270254.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/40024589852.pdfIn PDF document text
    • https://nissanzorba.ro/ckeditor/ckfinder/userfiles/files/wafusu.pdfIn PDF document text
    • https://actorconseil.com/files/file/wefunelowaga.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612f254fec052---6760178123.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021090517535180554.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/ecea3136fdced8eea0e8c4c66f57013e/nojap.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/sirajubomijopepa.pdfIn PDF document text
    • https://bursac.net/userfiles/file/29600844770.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16138b10c41755---kidijafutomerolubozow.pdfIn PDF document text
    • http://tochuchoinghi.org/files/runofatipuk.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/95337000013.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_off0000b689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB689 10532 bytes
SHA-256: f0ea8e592e7ff1a9102e5c4c6b09e66024116e74e0de24d591044e2e62c1c35f
font_01_sfnt_off0000ce5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e66f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66F 15044 bytes
SHA-256: a2f2964be2e58df7de993c6f6dfb5616e1691caca6b8a6970d85690c93208c72

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