Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ca0aec78b25a345…

MALICIOUS

PDF

70.2 KB Created: 2021-09-01 03:30:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a4f6264386bad64603552af23f8110f5 SHA-1: bc5dbe3586dd1882ad97f1112834b48aeebe8d30 SHA-256: 2ca0aec78b25a34585aea50892151b72c60235199521ef251eb8209e1b6d0b88
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to lure users to malicious content or phishing pages. While no scripts were explicitly extracted, the presence of numerous external URIs and the nature of the link farm indicate a phishing or redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084e1dc233f5---30730319349.pdf In PDF document text
    • http://pappteam.hu/userfiles/file/deregadi.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d241416fa---63295260253.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f24701c7ecd---73267415118.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/444ure4aldjajpm1sfu97eo5qa/80701210606.pdfIn PDF document text
    • http://3q1p.com/upload/file/210627040201437502lyvxgiosafvc.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/r8jriseo4iedg9sc92tmob9d4t/gegokivinovunig.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/04e280d2aa05ea942fb47e981b1e2980/55804006098.pdfIn PDF document text
    • https://mimpiindah168.com/contents/files/7421732542.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e45ac47f978---surilamesoruzexide.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/nojewub.pdfIn PDF document text
    • http://www.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/mof27mp9ibvgkeoatjart8vhr6/xoviponezag.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/faponamade.pdfIn PDF document text
    • https://okazionche.com/files/48378979709.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/e2e758a44720ddb19be3cd9097a861db/felaliduvo.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/5suigscueh9g669350f2dk6hr6/59429392478.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/bawuwavitamulubokupe.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/jojarenugureti.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/64955511897.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/werusemonemezijotas.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/45483207396.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/sujixamanoredujipekin.pdfIn PDF document text
    • http://edwindijk.nl/home/edijk/domains/edwindijk.nl/public_html/uploads/file/rosezup.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/73098696710.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=save+pdf+form+filled+outPDF 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_off0000b653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB653 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE65 14540 bytes
SHA-256: 3873ef1a1a99fad14028359dcac3afd0a2cd6d2190e891ae43da2bc3e8e68579
font_02_sfnt_off0000f2cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CF 10628 bytes
SHA-256: 46ce2ce400a598cc3657ca7d4803436bcacbd7837dfefaeed2c5ce536db5ba27

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