Malicious PDF — malware analysis report

Static analysis result for SHA-256 65277756953c6cb5…

MALICIOUS

PDF

85.2 KB Created: 2021-07-06 15:56:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: caf44c2be198a0f0dbc7a3c93896831d SHA-1: 6cf196bed8e292fc3bed9d8f100f0e1ad47b510c SHA-256: 65277756953c6cb581c3f8dca584626eb6278d71c17db127bb1192fa6d57d746
164 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a phishing attempt. It contains multiple links to external PDFs hosted on compromised CMS upload directories and disposable hosting, likely serving as a lure for users to download further malicious content. The presence of invoice-related language further supports the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://mofrantech.com/userfiles/file/91637922363.pdf In PDF document text
    • https://napraforgohotel.hu/upload/file/jawubozomawijaditud.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c45fb25caa5---jefodolenur.pdfIn PDF document text
    • http://saokienviet.com/uploads/image/files/mikobowek.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/9bebc0f978e5903c59240f4a23c18ee8/22924077250.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/xikufuwure.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/36178698127.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0111acabe4---tupub.pdfIn PDF document text
    • http://sshs61.com/clients/6/60/60e739d5a8cf4a6710e4f064fd99417d/File/fodaga.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/bbci5ug6aljpssg1uff2as8brv/bopexawipin.pdfIn PDF document text
    • https://pathakpharma.in/singhania/downloads/file/24418116412.pdfIn PDF document text
    • http://capital96.com/userfiles/file/460658894.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c9769e0956d---97566846275.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///20210604152026_230078219.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae6f98cc5fd---17781968155.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/944570dff35a30ee8b87a8919e9d8689/9116646157.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd4021bd16---53179232610.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608cbffd0bf11---68444691325.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/79f289130b5bbd438a39b381e7b009d8/38861621708.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/72bd6c245f40716be3d420dca115ef7f/97472345366.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607726a3ce20f---11570172917.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/zuxugavurewidivosol.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/96069847835.pdfIn PDF document text
    • http://voxel-avocats.fr/uploads/file/gotagobopevovuzagala.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=borrowers+taking+a+balloon+payment+mortgage+most+likelyPDF 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_off0000e8d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D3 17120 bytes
SHA-256: c32817ccf0ed77c1f0c62199fd2ed32de6ff6c9296b4981b9ad819b0a5ad2e26
font_01_sfnt_off0001155a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1155A 11080 bytes
SHA-256: 0c47684abe31da2782726b79d534ab1477a99296dc52e784591199f572812ebe
font_02_sfnt_off00012f19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1