Malicious PDF — malware analysis report

Static analysis result for SHA-256 3896ff883ab78b34…

MALICIOUS

PDF

84.9 KB Created: 2021-08-20 12:15:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 01b79d4df2e28c7a1aecd4a8a867cd43 SHA-1: 1fc3ac5338b8798954b3057da37ecf07234e47d9 SHA-256: 3896ff883ab78b348430e98803daebb3a4a99df356d36c4a772beb9173ba90e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious redirection techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://chinasoftcore.com/userfiles/file///76824020106.pdf In PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c8fae3c0c---79041822301.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/ee78c8c5fb9bf5844c7fa8325c91e0a5/xunux.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/20881608492.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/xevixubexini.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/e483b55a1fbdc4329d9a8e19cd791456/rojidami.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/nuguxuzewifurekaxawiw.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/e6mpte1nptriml5lj4ei7mibvb/25377259923.pdfIn PDF document text
    • http://geniuschulatutor.com/userfiles/files/47051890935.pdfIn PDF document text
    • http://altinay-law.com/images/file/69599936100.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/t23fnqueuvsv5gt9ecjvmjl7og/86354885072.pdfIn PDF document text
    • http://cfacgroup.com/uploads/FCK_files/file/vepitesexafakosexedel.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/69626395939.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16108ba448c6b0---zoninukadera.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/puwutofi.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/35889426981.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/2dd90a2c5f159753b6781bbc2dc9b3b8/sejutakujutevijon.pdfIn PDF document text
    • http://bjsprt.com/uploadfile/file///2021052001561082.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/wiwupisenirukiz.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9bd10d3375---bepiniwajofotu.pdfIn PDF document text
    • http://denprokhorov.ru/images/file/zepirerasobatavalexegabuf.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/44655327339.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/97944146475.pdfIn PDF document text
    • https://tempegaring.com/contents//files/4526041661.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/7421747024.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=what+is+the+meaning+of+capsule+filling+machinePDF 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_off0000e820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE820 16844 bytes
SHA-256: 6129c4bb4c7c9037f650fd070419839639718baa0b901c8d6dc9a5cb240fe2da
font_01_sfnt_off00011416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11416 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C2D 10920 bytes
SHA-256: 781434034e7e5462a79973b20e17704b04f1d059778abb70a610e2e83ca5bbf9

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