Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd7d1d7294cc2c78…

MALICIOUS

PDF

95.9 KB Created: 2021-08-15 03:11:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c42b76c2c3440903bb3002dd21255dd7 SHA-1: 1cd0b46620e9f3fbc42ecc44d7be51bd720ce1b9 SHA-256: cd7d1d7294cc2c78256ef000a4798c7296e7792eb39d263c97639f551cd9dcc0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to PDFs hosted on compromised CMS upload directories and disposable hosting, suggesting a link farm designed to distribute malware or facilitate phishing. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b864b76d5---15681950863.pdf In PDF document text
    • https://sapporopools.com/contents//files/gowilegepobibusafegeteve.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/67046973621.pdfIn PDF document text
    • http://articolo17.it/siti//usr/foto/files/tapir.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca450a1ff9---xozopifabeja.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/mudaporiteguvuporumo.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f275ddcdb---taxetuzixenin.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/9243227273.pdfIn PDF document text
    • http://veribase.com/E/file/zulejateteronebow.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607d02250771e---28409682513.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/a91e58321a8acff8410b79ef82d02e23/80249356426.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076be5fcab2d---44777103089.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/30212349577.pdfIn PDF document text
    • http://adamslakeband.org/userfiles/file/burotegixejepi.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/45158398848.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160abb24c09163---nedozasati.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/20830259931.pdfIn PDF document text
    • http://flightshop.jp/images/blog//file/1069014323.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/49e6aa53ce675fbac01ce451f06f2b77/86881905986.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/26800145224.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/gigegejabag.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/068a1f87b569ce1c71109f58022ff569/83851808157.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9a11549aa---79406748525.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+set+pasnew+watchPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF203 1724 bytes
SHA-256: 70fc45b731c8f2a9e57c751f42bef7c7328772979cff99109cd6d3d80c47e8a1
font_01_sfnt_off0000fa33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA33 10308 bytes
SHA-256: d44009bac80729bdd7568c202defbb1ccd05fa7d4094efe2e66207af158a3301
font_02_sfnt_off00011171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11171 18004 bytes
SHA-256: c838640a928234bd1c2d681605f7d574e2cf06b84aae3414111e6d5fb4d3a8e7
font_03_sfnt_off00014109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14109 16192 bytes
SHA-256: 97e3f73a58ccdd4784c9ae1678d9f90717e6b6d0c87c36bf93adb8865ef65ebd
font_04_sfnt_off00015695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15695 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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