Malicious PDF — malware analysis report

Static analysis result for SHA-256 45b781b3bb3dbf4a…

MALICIOUS

PDF

83.3 KB Created: 2021-07-16 14:12:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 15d608c38a4dd85bd6c77b3ebfd951c5 SHA-1: bd2165acee411153f62b8750cd6d10c154e71631 SHA-256: 45b781b3bb3dbf4a5ff6b8ad37ad7d6e51297dec1d8a73f5571f8bae88b67a30
156 Risk Score

Malware Insights

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

The PDF file contains a large number of links, many of which point to compromised websites and disposable hosting. This structure is indicative of a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099cf7f23a0c---85842663978.pdf In PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/a7951124e8c26b31b84420ca0304f691/vepugamivunometim.pdfIn PDF document text
    • http://phuclocvienjsc.com/uploads/image/files/mirisujozu.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/d0a2f21606055e8d05a0914b9a497f22/47381316058.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/ioq3mtscsng3k1i9v3j7c659q9/nororarozobogox.pdfIn PDF document text
    • http://diennuocdanang.com/uploads/image/files/28249591702.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16080d4d085f0d---redemenosofozegamitev.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/53941931809.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/ec24b372ff193e7a0ce05cc120d28d72/jupapas.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210714125848.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/ratate.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/599f40d8fdeba4a9701caa6cc542083f/25542713033.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16075b909ae044---7452669025.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/a8ab4e93a65d981072acea39333d5193/29022731853.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/76188614126.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/e7a295cec7388b02938cf46bc7ee7ca3/gipiduxuwutezowen.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160b2156de54b3---zolejexowar.pdfIn PDF document text
    • http://planetamama.ru/files/file/85501276083.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c490a062aa3---48579304135.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a011c09c2fc---48803217632.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0019129001621952181.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/cqnupvnkt5pf8c77072u8e594j/83828914124.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/58471915523.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=hardening+low+carbon+steelPDF 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_off0000e2bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BC 10760 bytes
SHA-256: 10b4e80ddd9ed984cd05d9f14d7242363c95af9716fd6ad4db53dbeb898a10ee
font_01_sfnt_off0000fb67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11379 17088 bytes
SHA-256: a3b9cf3f284b2e165d2c6c80042b9a8739a3b03333e26183a56a94190792e534

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