Malicious PDF — malware analysis report

Static analysis result for SHA-256 05e4dff44612bb12…

MALICIOUS

PDF

81.7 KB Created: 2021-10-12 06:26:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3beb1877a7d40db7a538b3b5d0091df3 SHA-1: b407a22f8e484a687bf025893053675e4342484e SHA-256: 05e4dff44612bb12a5667fef2cf61aa28281644030d84477d4ffef3d39515aa5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised WordPress uploads and disposable hosting sites, likely to distribute malware. The presence of a 'download button' lure further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crewmak.ru/uplcv?utm_term=how+to+compress+pdfs+into+one+file PDF link annotation
    • http://taborgospelassembly.com/userfiles/file/luvedu.pdfIn PDF document text
    • https://weilmclainboiler.ca/fck_upload/file/60920505044.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cabe6c40d2---migiliwipifeladajimelul.pdfIn PDF document text
    • http://surausa.com/uploads/files/81845089594.pdfIn PDF document text
    • http://idcla.net/upload/files/vezazevited.pdfIn PDF document text
    • https://kingcom.edesign.fr/gr33/web/uploads/assets/file/20257322660.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef41f73a51---pepesivunazeg.pdfIn PDF document text
    • http://investgeorgia.ge/userfiles/file/87608829836.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/94854920240.pdfIn PDF document text
    • https://currenwatch.myhost360.cn/file/upload/files/10-09-21-54-50-73.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/latogikusigiza.pdfIn PDF document text
    • https://aspirans.com/files/file/wireso.pdfIn PDF document text
    • http://szjglaw.com/uploadfile/file/2021092618552573499.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/29209488595.pdfIn PDF document text
    • http://nhasachconggiao.com/luutru/files/25173141853.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/xirim.pdfIn PDF document text
    • http://jnejendomsdrift.dk/userfiles/file/32861724509.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c99278980a---zovogatutaxepo.pdfIn PDF document text
    • https://salwangurugram.com/files/67664092714.pdfIn PDF document text
    • http://brbud.pl/userfiles/file/golowotesuvutadizur.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d03b5a3a88---pokajiwiwoteminagi.pdfIn PDF document text
    • https://pecsikult.hu/files/file/34238232584.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_off0000dafd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f30f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30F 17660 bytes
SHA-256: e73e3d44508ee2b066a7673f40900511f39f328610976869c2d169dad393ab47
font_02_sfnt_off000120f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F0 10696 bytes
SHA-256: 5576f7624de2ccb2767ce8f15e9bc64527f2cc5ddbdeea66789baeb38a976db9

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