Malicious PDF — malware analysis report

Static analysis result for SHA-256 e959e8adb6726964…

MALICIOUS

PDF

89.8 KB Created: 2021-07-20 22:41:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4e82e7fb975cd885dd8eb54b8d6cfd97 SHA-1: 000a8f38671ba5d6117a5474c1979f38c85d888f SHA-256: e959e8adb67269645e50bbc807b588eb0be03bf12714ce0384c8d904afe250a4
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the PDF functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of multiple links on potentially compromised CMS upload storage further supports the attack pattern of redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://allcreaturesinc.com/files/files/92005282856.pdf In PDF document text
    • https://santechnikosdarbai.lt/images/files/pemasak.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16083b16ea6e3b---45590301081.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073db4d9b45a---rejupaxigeribupekafa.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b863e77a01e---puwugegizupimawaboduza.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/zagigelezikosupat.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/0jtjm3oiqt05aufod6da6dmdf5/ditef.pdfIn PDF document text
    • http://allasclub.com/campannas/file/76356438423.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/4kcgi4pdqaebft80qnfa5afuvu/74507869198.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/96788849714.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/vajelalubedolutunirid.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/865c1dee098c4634a69f52700b91ddba/nesiniregoj.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/jepedudaxikufozabi.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/vamegegi.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/zomawepopolexunut.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/61051652557.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608a76c7d8e2f---28438688802.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/ririboximesibubenajokot.pdfIn PDF document text
    • http://zzquansu.cn/d/files/fuwezosununib.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/78280278294.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/fabemitegamivazubemog.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/jixosawutopemuteketiw.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/39313294202.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c30ed05e6f---81245195482.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=apa+7th+edition+for+websitesPDF 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_off0000fb59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001136b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1136B 17412 bytes
SHA-256: eeae18633e953f0ca9a4c45c886445a032105cce52baf43cbadad09f4631e0ae
font_02_sfnt_off0001410e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1410E 10808 bytes
SHA-256: 7f614bfcf9492e2282fd9490be8fda5d0d0a9b0fc9d378e2ada2e928dc900768

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