Malicious PDF — malware analysis report

Static analysis result for SHA-256 55e0c9e0d8da53fb…

MALICIOUS

PDF

79.1 KB Created: 2021-07-18 17:46:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 5a95990961dbc5a03573b0203e723079 SHA-1: c2249ce271ceffa20fbd9a461cfaac542527b3d1 SHA-256: 55e0c9e0d8da53fb399f96ee17f0aaa166217eaf516ee59c0497d1e7d6d26fd2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm hosted on compromised CMS upload directories, suggesting an attempt to distribute malicious files. The presence of a 'download button' heuristic further supports this, indicating a lure for users to click and download. ClamAV detection as 'Pdf.Phishing.Trojan' confirms the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • 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 http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb01c18918---zulid.pdf In PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/25976386884.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e0f2d322b7---26980937613.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/33279111301.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/39c256256e1f38f3c04ab1f800e1286d/xoperolafogigekigukixinux.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/mpaf1hm6a5c7s2kjklh1dfqnr0/lipetefo.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/nagajurumo.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/ba3012e2987ad2a54f44adf65010a09b/kivokiw.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608516a136a0a---87501023932.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8bd55749b---likutepejuju.pdfIn PDF document text
    • https://tidaksusah.com/contents//files/vogokeseziret.pdfIn PDF document text
    • http://asustainable.com/global/file/buxodumuxoge.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbcf487fec---jepiwoxagovatopifunazi.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210712_8CB3CA52FD981997.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ace4977a063---janixixazof.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/sezabomud.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/75266778787.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/62200644764.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe23229e3e---zawafutuxabagida.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084190d21ce0---zitotuwivumojizisagu.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e252e75db---voxoweketixevig.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/kedasinumiloji.pdfIn PDF document text
    • http://wenxuezj.com/images/File/64510298955.pdfIn PDF document text
    • https://cape-electronics.com/media/file/79743174102.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=effective+labview+programming+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B8 16676 bytes
SHA-256: 5ea78f21adb9a3bbb12ca2c0fc204708c930d82c6c4f1d44bec3c266e8fa90de
font_01_sfnt_off0000fdf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001160f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1160F 11072 bytes
SHA-256: 17c19d4f67107bbb21628da4e54962ded84c64bfbf9f2e8b11b786f3d0f76b86