Malicious PDF — malware analysis report

Static analysis result for SHA-256 420cf566e176b0da…

MALICIOUS

PDF

95.7 KB Created: 2021-06-10 20:47:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 243de9a73ebfa6b3b770a3dfe6328c08 SHA-1: 4f1edb08702080adc48572c22b47659445bd19d2 SHA-256: 420cf566e176b0dadc4d568d6ffa402772f6710550bf0372bdf9b7d92042dabd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm for distributing malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution disguised as a book download. No scripts were extracted, but the extensive use of link farms points to a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://queure.ru/uplcv?utm_term=microbiology+an+introduction+8th+edition+pdf+free+download PDF link annotation
    • http://eprdel.cz/userfiles/file/63266383081.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c22587a788a---92423331355.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/8769707571.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16089ff94bcb1d---84752940789.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608efd434eb6e---bumedur.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608a953f1f225---wavisonokiv.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/kojutenoteveg.pdfIn PDF document text
    • http://hanleyresources.com/images/70084617798.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/af1380c97192f7426eb4fbdcc6999dab/nuxazunolifowigavupoxareg.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/pthg84b836t803aa1ptuteioth/janisamebepeferewiwa.pdfIn PDF document text
    • http://hilltop1976.com/clients/24685/File/65822599407.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9b68cf74b---42456925947.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/ripemenafabalabuwepi.pdfIn PDF document text
    • http://highlandhighclassof1962.com/clients/c/c3/c330a44b04b080977bf299ea430a317d/File/54171838973.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/m4nnpa8ionq6illjqr6obn732j/48882550465.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000133a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133A3 5772 bytes
SHA-256: f1c3d4962e6bca29e45cec1f47a0e976ed592d1eddd50d1282f5baac4fdf28bf
font_01_sfnt_off00014768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14768 11844 bytes
SHA-256: 73d267c797bbbefe291b4ab0868256d7c4b410440fbd7bbbfee55a76550e777b

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