Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b7a6aa7f79576a0…

MALICIOUS

PDF

87.0 KB Created: 2021-07-23 09:22:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ab77c6d90058fd312d767d23c549be4f SHA-1: 59b0e9de172f13a07fdda3b06b64eda72e2f0c40 SHA-256: 2b7a6aa7f79576a0d3a84b82add96d76fbfb31a501be9b2de2abd559f5d04b08
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm on a compromised CMS. The embedded URLs, particularly the one hosted on chicagohalo.com, are likely intended to redirect users to malicious content. No scripts were extracted, but the PDF structure and URL patterns suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609863e69a95e---fadipipopub.pdf In PDF document text
    • http://pro-group.ru/userfiles/files/75018515237.pdfIn PDF document text
    • http://sostrevalli.it/userfiles/files/3543274472.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/09e66cbb86e41eb1290e94368771e448/62821001006.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/njq6ihvhanchklgft34efulfd0/65686549279.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/75be2be5f84d795982d7457cfc6500f1/12755215628.pdfIn PDF document text
    • http://614move.com/clients/4890/File/36652779515.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/devififaforunex.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/zuloravenofufezeze.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bf434964cea---jamonadekumenagujelot.pdfIn PDF document text
    • http://kotolantopeni.cz/file/rexelaxuwap.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4861576b88---19157088918.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/htpq6l2gi2he6dvo6pbiqrqekl/tekozaxobafetetigudigu.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/42969343668.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/c1ef1f7ff22377de17f2d5cb8c2a78c5/rubupukuliv.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/26147677625.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/13767509088.pdfIn PDF document text
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/0ba246754e6d52f92b839ee44fb76808/turigavowenolazi.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f06a956679---59651726929.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/35622215841.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/wimutarujikamoxebesanufib.pdfIn PDF document text
    • http://innobiztour.com/FileData/ckfinder/files/20210720_2B681861123537D7.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=chicago+style+sample+essayPDF 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_off0000efe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FF 10764 bytes
SHA-256: 56b94ca1ae8cb247ed0cff59548e681635595c59a2d3d04c139d8adfd67c5bca
font_02_sfnt_off000120df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120DF 17164 bytes
SHA-256: c3db748838a7a6a06ad97aef7568eca891f1d2519ea628db831e682a91c0dad0

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