Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b8b43ec7716bdd6…

MALICIOUS

PDF

85.4 KB Created: 2021-07-24 20:47:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1baaa55b9ebda7740df6daa2e3677b05 SHA-1: 6bbf4c29df5d7493185f970c3f3dc1499aab4af2 SHA-256: 6b8b43ec7716bdd6de0d13efdd9c10c8ea786cd21fbb1e7bb18e3c6eb94b78be
156 Risk Score

Malware Insights

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

The PDF document contains numerous links, many of which point to compromised WordPress sites. These links are likely intended to lure users into clicking them, potentially leading to further malicious content or exploits. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with a phishing or redirection scheme.

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://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/4fadba42957c940435c83f00ffaade7d/93005268953.pdf In PDF document text
    • http://vietsinphar.com/uploads/files/birirolitidanov.pdfIn PDF document text
    • http://africareview.in/userfiles/file/39835489183.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160883cf03bf6a---44116557778.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/f16fbfa1d0af2a4abc3076a67ffcb95d/tinulagagijopefiwapo.pdfIn PDF document text
    • https://kientrucqhouse.com/uploads/image/files/18349523416.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/37674044778.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/livtjf7alnt540bbopb3af7ot0/44405728979.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/88a8e2daece72276ab4fafc1e8eff6ac/bovadapijanibixupexaf.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e94813a733---6277013886.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/rogeziluwabujed.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/d3ae307931806957e4a6b8ed6aa4369c/baremikonokimezivel.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/f3c305309ad73224b4ff7be11b2d69a0/libiz.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/26300598255d36c39f6007fefebdac40/vepokiw.pdfIn PDF document text
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/nizog.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/jodesofido.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/e8548887402170cf294cffb8f632cbf8/1231504055.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160814995a4dc8---pijamurugiguposixene.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/38437846839.pdfIn PDF document text
    • https://wsbtitan.com/images/file/gukugefenozulumovezewax.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/55757835660c73ade06078.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607958588da9e---vozixibowukotim.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/0bi6bfa1r6etgr0cgbv4obaesc/tefup.pdfIn PDF document text
    • http://yongqingtech.com/d/files/mirujatobobulosotube.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=what+is+nvidia+hd+audioPDF 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_off0000ec51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC51 10224 bytes
SHA-256: 2c2f0d1896d539d0f189627f248f0a66da3895721c0a6ddbb21f252963edc13a
font_01_sfnt_off0001033c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033C 17072 bytes
SHA-256: 31b7d5ee6a2c10f73d39be743cf611b23193052da5fb2c4ec854df50dde96a94
font_02_sfnt_off00013005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13005 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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