Malicious PDF — malware analysis report

Static analysis result for SHA-256 cacc8bd2dafc69dd…

MALICIOUS

PDF

88.3 KB Created: 2021-09-03 20:12:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5d2bc83c6e039a3c84be24f0733a7ba7 SHA-1: 08791d6a8cc5368cca4d472152c71060fd8c5660 SHA-256: cacc8bd2dafc69dd7ee223ea0a9a40049f4651e25f502526595334666f5ac7b5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics as malicious, including a high ML score and ClamAV detection as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and link farm characteristics indicates an attempt to lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://ilturismoinitalia.it/userfiles/files/zariludenezo.pdf In PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/1333734ebd7984d1a3685d2bf5d5b02b/bedegixebo.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/legapotedekodewisemufuvix.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/lonijenadakipebinuse.pdfIn PDF document text
    • https://x-software.cz/data/file/depenavimob.pdfIn PDF document text
    • https://sukaunited4d.vip/contents//files/pinawit.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/62182275458.pdfIn PDF document text
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/31519066352.pdfIn PDF document text
    • http://linhkienhunganh.vn/luutru/files/84110205123.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/836321a6355f36de622cb7578a062274/10554534585.pdfIn PDF document text
    • http://studiolorenzoni.eu/userfiles/files/xasaridisekakeruveri.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794fd868f4f---93707458695.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d1c92578a---3029959529.pdfIn PDF document text
    • https://gangnampools.com/contents//files/ladenezirubemodika.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/kanumupajuzarow.pdfIn PDF document text
    • http://idcla.net/upload/files/jerosamuwokogijis.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/96704273726.pdfIn PDF document text
    • http://cyclad.org/UserFiles/file/mowakogav.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/7282b56f6e4148d5b55c4a6090525b7b/62970723874.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/9shr5nh7oj3vt72uo81fj82o60/nowabederedoworozipa.pdfIn PDF document text
    • http://vanharteyoga.nl/uploads/files/25053765244.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/70381594137.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d34be20fe4---kokeboxiwozudulufaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=easy+way+to+learn+french+language+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_off0000f086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF086 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10898 19152 bytes
SHA-256: 0d158f53085e45468e06ba8c6d4dfe815335b7850f53523efd455c2067a8b5a1
font_02_sfnt_off000139e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139E2 11092 bytes
SHA-256: c274f46cc856dfec0dcdb49809f0165e55bef267e3b7632d7c2042ea4b1d7963

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