Malicious PDF — malware analysis report

Static analysis result for SHA-256 674b4f14c1b42a8d…

MALICIOUS

PDF

73.8 KB Created: 2021-09-04 00:49:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 95e10c4a0dd6a26336a4c318a9c9dc2d SHA-1: 23bb582c1d8017b143885290f81f0ff8d887c1ca SHA-256: 674b4f14c1b42a8dda8f3f4dffa233326d8818ba91c17e9803bb7b06689df1e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites, indicating a link farm designed to host malicious content or facilitate phishing. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these external links. No scripts were extracted, but the structure and URL patterns are indicative of a common phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • 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.
  • 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://queure.ru/uplcv?utm_term=tahas+basal+lansakan+worksheets+grade+2 PDF link annotation
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b6748970e9b---5490807313.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609962eaf0e91---8872834747.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8bbf0eef1---37712425023.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609ebab995027---gikimujafudazovavavop.pdfIn PDF document text
    • http://bonezi.morefriendship.com/upload/files/darolasufosibamapevulof.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/tevinaridovulojepuw.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/lulunamo.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/xumujamepezumogetij.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/gixedikejanevi.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/77469365021.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/3caffe318ce7ebababd353c4c249f80b/69580186561.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/wofufenimanilagoxo.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/6cc48a0c916e73edf6319fb908982c56/66716178912.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/kijezevexajabavuxatamo.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095d98076430---59559000044.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a88761f9c4---40562508067.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/zemam.pdfIn PDF document text
    • http://samtekelektrik.com/files/navabimexu.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/48857179954.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210702_8D74A2D5B4FB753E.pdfIn PDF document text
    • http://akcihlar.cz/userfiles/file/tezafofezemizife.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_off0000bd30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD30 10836 bytes
SHA-256: 5e81c7ac60958bfbff626329f45f6cb8c5330bc5eedfd42150b47e01668016e9
font_01_sfnt_off0000d61a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD61A 16980 bytes
SHA-256: 1e8e533ab1f9e42d3d962a2798f2a2321f5a219dcd9235fd2e8d3d275accd46f
font_02_sfnt_off000101d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1