Malicious PDF — malware analysis report

Static analysis result for SHA-256 eae7cf21d1b28073…

MALICIOUS

PDF

80.4 KB Created: 2021-09-04 05:18:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a84822f21f0f3b0194fa2aa42049cc50 SHA-1: b4b10c4b9597d58346bf0c430a5d26d2b64d5da2 SHA-256: eae7cf21d1b28073784df332de4595345a98075422d25e870d123ada49e61cd0
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories and other potentially malicious sites. The primary purpose appears to be directing users to external resources that likely host further malicious content or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8fcf58245---11209947061.pdf In PDF document text
    • http://bioscipublisher.com/files/upfiles/file/32963957207.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c235c8bee4d---jimexilebedivijor.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/18099689844.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/49699537200.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073908782e15---godoregemu.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/kovuzimiz.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/38606880788.pdfIn PDF document text
    • http://absigorta.com/E/file/zamugu.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/ffe394078a0703306aa2a3ded3533150/gatujurafivuwagomobuseg.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/11643191493.pdfIn PDF document text
    • https://atrax.eu/userfiles/file/33754983156.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/s172dd23quga91o2qrspjj6cku/51273035015.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/78445802078.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/4b923ac70397c010eaccc3b20462641e/24076377371.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210713141341.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075330583210---lowajevamewuxululemuva.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/6819682655.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/defa62400aef2acf731600220fd8c915/webanawerasipijawevi.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/e624545fc8d97434f8281e9902a88df0/71680392885.pdfIn PDF document text
    • https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/b561c6fae384e923f5bf83deaeafa8a0/nidetevoxora.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfae555b14e---6093597583.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/vp788bu03hvhngdn64fq9sell3/xusigasikamufawoweparezi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=kettler+crosstrainer+axos+cross+p+manualPDF 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_off0000d75d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75D 10728 bytes
SHA-256: ac3fc0de96e92257be717939da6d19a62c6a32452cb3786f23926ab5aac26764
font_01_sfnt_off0000f002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF002 17140 bytes
SHA-256: de04a322faf2d20e287d9803893ec0a9ac5f21dcea7c187790d5ce4268789c93
font_02_sfnt_off00011c32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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