Malicious PDF — malware analysis report

Static analysis result for SHA-256 814874ed63d904e5…

MALICIOUS

PDF

87.6 KB Created: 2021-06-27 14:28:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d74a09937cba7363da2b4b81b13a56cc SHA-1: e8cf638be826904f70f1d77a9fc74002b2790ef0 SHA-256: 814874ed63d904e5cb3fa987af7da41f16ededd7d9238511614114b9ea01f976
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics strongly suggest it is used as a lure to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://synerhu.ru/uplcv?utm_term=11+stone+4+in+pounds
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/24f4c4f05f60925a8b104f244be7d1e8/sivok.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/7aa22903f29b3ed490040ec09b97188e/55568950231.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/pabgcoqfhnre09cthplhbk19pu/29209228903.pdf
    • http://jl-vacuum.com/upload/files/nikenupitopobavuwov.pdf
    • http://cipetbhopal.com/webimg/files/ragolaled.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090f5c6c658c---lolukaxitan.pdf
    • http://safires.cz/ckfinder/userfiles/files/99971327317.pdf
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a626954b8b3---54362166215.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ed2948fa0a73cf5c5f42bd57edc8a5a4/46304354282.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/p9erflpbdutddfolsdas05f445/mutubipabibuduxul.pdf
    • https://kaowei.tw/image/files/20210626_215906.pdf
    • http://asijskepotraviny.cz/files/file/79683539624.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092908675d70---mevunixozazumafito.pdf
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/8522014887.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a34c336438d---fediduwadovuvotunit.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1ada0d9f18e924569661c976905af671/jawinakexarab.pdf
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/qshap753bo05asfaqef6lrl1bp/kitotux.pdf
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/548ffdc8de6656d5e99d7bd6ff632d7e/79988912514.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/b962v8dgfos1i1huemnakv33ud/28640287851.pdf
    • https://ludifrance.fr/userfiles/file/26200896318.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606c97ba2f063---pimusoned.pdf
    • http://prime-standard.com/piceditor/file/lijetikeza.pdf
    • https://paklya.su/design/img/upload/file/bejalujazugulowijexomonon.pdf
    • http://tasarimak.com/ckfinder/userfiles/files/ruloratetaludepa.pdf
    • http://edu-family72.ru/content/images/uploads/file/xomivuziwivu.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/b9c3edeaff51e31eaf5ce720a2fd7d40/zobenolotolomakowimudase.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3bc.bin
515e8ee889816e364dcdea0b0870f4ea5e872cf59fc0739a76e81a21d9568465		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BC 17592 bytes
font_01_sfnt_off000121ef.bin
56c9d80961177ecae56c929d69e0edd6ada6818c2673cb3e5f6d5618fbd930f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121EF 10208 bytes
font_02_sfnt_off00013903.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13903 16792 bytes

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