Malicious PDF — malware analysis report

Static analysis result for SHA-256 930a2aadbac34a22…

MALICIOUS

PDF

73.7 KB Created: 2021-09-20 10:28:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 81bc4141456c63ed562d750e00f44073 SHA-1: 7f8e9333bd25758c95c2d16376fda5adf7338ee7 SHA-256: 930a2aadbac34a22c1c6ad3f4f35c46c32e153bbf429ef22bd09c826c111c86f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute further malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://akifkasaboglu.com/esatfisek/images_upload/files/69139594933.pdf In PDF document text
    • http://bestpokeya.com/uploads/files/50722759015.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/xitamusu.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/59773915917.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/563503679.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/161312794012b3---35879119184.pdfIn PDF document text
    • https://mogilew.ru/userfiles/file/46420708858.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/nisapiparepewi.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/tisijapufeso.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/gadosizal.pdfIn PDF document text
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wixivoka.pdfIn PDF document text
    • http://harckocsik.hu/userfiles/file/55087990489.pdfIn PDF document text
    • https://vinniescustoms.com/userfiles/files/43133245119.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/161359581c78cb---21456125602.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/dafepuxebo.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/5009655562.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/35295672435.pdfIn PDF document text
    • http://lblussana.it/images/file/74110635769.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/bazulu.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/85672300014.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/033cbf97da2614a41b114191f5733040/sazovesesaxifej.pdfIn PDF document text
    • http://2222.netsociality.com/upload/files/savolunetutej.pdfIn PDF document text
    • https://kristinanamaste.eu/files/gazejip.pdfIn PDF document text
    • https://nexapos.com/upload/files/47903763624.pdfIn PDF document text
    • https://kiptep.ru/file/30642835558.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=gtv+live+apk+downloadPDF 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_off0000bf70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF70 10400 bytes
SHA-256: 9f267bfbb68c74db22cc1141a373b4e10d1638f164e1682b394eb47fc0b88691
font_01_sfnt_off0000d722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD722 16148 bytes
SHA-256: d0fed24eaa4cc464ba701311e80e5e888f28cbb9a5a7d3a9c65a959bfe8a10a3
font_02_sfnt_off000100e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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