Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f843539b0862af1…

MALICIOUS

PDF

96.4 KB Created: 2021-08-30 05:02:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 72b190fcbc8f89c44bada444f7f90211 SHA-1: 63a5909dab1a7a8ca454a950961678df44f24dce SHA-256: 2f843539b0862af1a7bcc8500d3fd5240a9dc2de0c6b03cc2929d3c3eec13ef6
156 Risk Score

Malware Insights

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

The PDF file contains a link farm that directs users to various URLs, many of which are hosted on compromised CMS uploads or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish for information or deliver further malware. The document body is heavily obfuscated and appears to be non-readable content generated by wkhtmltopdf, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://techsystem.gr/data/uploads/ckeditor/files/luzitikenuxixos.pdf In PDF document text
    • http://pc-driver.ru/userfiles/files/lurorobibexexebedikigi.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/6586412113d1479cc21049177d2f9011/77633384407.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/vuxanitokituribitojag.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7695028421---jolukebufufuva.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160f0c6e4ad301---gusilalotogupejojeruj.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/43714284082.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/28016925096.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a00c24acc27---16835817424.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/kncftotaumhb80ntpkrbt0bhdg/73048767331.pdfIn PDF document text
    • https://zenithservicos.com/userfiles/files/13443147749.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2f45554a1---buluzirawag.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/79364119468.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/6fb8c6a2386c0b76945d880d7f5f535c/5780186803.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/wozugugaravenez.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16111bf33c5940---89726190394.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/9a461a41d773ad7d47a23bb6c921575a/bakefokarinawanazegig.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/72601035795.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/takakigoziriwuvetavevode.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/xebabomudibu.pdfIn PDF document text
    • http://liyangah.com/Upload/file/fepatodubotesidutunev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=index+of+mp3+shinedownPDF 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_off00010ed8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED8 19480 bytes
SHA-256: 1b7fe65b7aaab2972e30a5f5f49492bf3706f671257818f6a808efa6b1a8c1d2
font_01_sfnt_off000141c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000159df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159DF 10668 bytes
SHA-256: 6672c0e45ac8a4a9ecdc16afcf13d0e69de5414a9c8dfa03199cd587dc432391

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