Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff38bef3bfb4d20b…

MALICIOUS

PDF

71.0 KB Created: 2021-09-24 14:10:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 81e8ef537f7ac766d18d42855337cc69 SHA-1: 3684aa2543f660a302d744b749e123af25111b57 SHA-256: ff38bef3bfb4d20ba4734d6ef4f754a47443269ad6565bcdb97b414e8645b4c9
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or link-farming scheme. The PDF structure and link farm characteristics align with common techniques used to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://allytemp.ru/uplcv?utm_term=how+do+you+rotate+a+pdf+and+save+it PDF link annotation
    • http://stlukesfp.org/ckfinder/userfiles/files/rimofo.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/40876526872.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/zuxepijuzanin.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/denapifivofigepexeke.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/pumipogesudopalakaxuguvif.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/18684344273.pdfIn PDF document text
    • http://kool-house.com/upload/editor/file/51118121688.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/20536303399.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/ed766783fcc08d7ca61e97f3bb7f25c9/9978500995.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/nixefu.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/45534935826.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/4b82a6ae2c282ea7af95e9687c1b9cb1/2920671329.pdfIn PDF document text
    • http://anninhsieuthi.online/upload/files/84050744794.pdfIn PDF document text
    • https://casadko.fr/userfiles/file/73347379590.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/divunasezekolag.pdfIn PDF document text
    • https://self-storage.sg/images/uploadedimages/file/jatugixudijorujo.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/vupenogazux.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/7ee9074dc6fa4853a3457f4eedfa5f2c/mipomisutevujadobamakuved.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/vonemav.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/46114137437.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/13672443332.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/40458732034.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/19739874172.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/liwiwetikojetivajajiwode.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_off0000b0db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0DB 10804 bytes
SHA-256: cccf6a1f30e2473f6038fd57d883b27c4c6b104fc05aa512fa4f9d87ec1e49ee
font_01_sfnt_off0000c9e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E8 17608 bytes
SHA-256: 4efccd1383abb75035521e5da956ab5f5683c59b432b5e1b7987357752a3de54
font_02_sfnt_off0000f658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF658 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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