Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a1e113519d4f458…

MALICIOUS

PDF

80.5 KB Created: 2021-08-15 19:22:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f7197fd57fc8f56f1c94e65b992a4d2a SHA-1: 27123b4e7e4a541a93db8a3a575d5bd20d3e3b63 SHA-256: 6a1e113519d4f458fabf712beb1e756facb0b6cf818403d5ebe6af99b252f5b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by a ClamAV signature and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites or are hosted on disposable domains, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior. While no scripts were explicitly extracted, the nature of the embedded links suggests a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 http://ncteonline.com/userfiles/file/3133945121.pdf In PDF document text
    • http://eot.mn/uploads/userfiles/files/finabigozu.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/tusemirigenuxuditufojoj.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/zoxosidukefu.pdfIn PDF document text
    • https://longhoang.vn/upload/files/44108674005.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/75202225302.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/89035604501.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/6548160489.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/xipejiwavaguwanol.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/58aaf95812bcb70918b148628367a82f/27593261823.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/wimaxujafi.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8110a84e9c---sufasobuzawebogejafus.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/l97tolmjra0belkc6e44hoj3c3/50568356147.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/77378180355.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210727115628.pdfIn PDF document text
    • http://atek-ent.com/upload/file/kodudizutelof.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/dozidetasuxoja.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16106b6547edae---94683409070.pdfIn PDF document text
    • http://hnspkjx.com/d/files/naninusuwetadix.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/14614551109.pdfIn PDF document text
    • https://isleo.com/i_photos/file/10533584161.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/dabaz.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609417a5c8808---ruzawolojuluferom.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/c2f3a6f8a4650c6cec98584c2d35921f/dulakutemizidanu.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfa27614b9f---41788054209.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/56983973338.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=reading+comprehension+for+advanced+level+questions+with+answers+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_off0000d552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD552 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED64 16824 bytes
SHA-256: b3900c277c8101dab07e31a65051f54c0a7c475fcf83228015820fc58c696c2f
font_02_sfnt_off0001192d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1192D 11508 bytes
SHA-256: 2835508e8a85fbed3f9d512bb16db15bd949c67163aca90f7ddbe0a705d54956

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