Malicious PDF — malware analysis report

Static analysis result for SHA-256 055faaf07cb1844b…

MALICIOUS

PDF

95.6 KB Created: 2021-08-09 15:05:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: a3b25f28ddac5888702ef40d297c02bc SHA-1: d2f1ca04f0baeae8ea39750c25b3459a21817e2f SHA-256: 055faaf07cb1844b551967fbf0744a0308edf1caab72f334fa527b5f8b924399
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal a link farm structure pointing to multiple compromised CMS upload locations, suggesting a phishing or redirection scheme. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of an attempt to lure users to external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c58a7f9d7e5---37030882397.pdf In PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16084fdf00e0a4---52872036492.pdfIn PDF document text
    • https://hirurgija.me//files/49333543897.pdfIn PDF document text
    • http://retrofotr.cz/files/file/rezijarimozudo.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/708b9539df7b492aaa56eecfe10e7f77/gilenenagukodadapexuri.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608d54453fbdc---rudowo.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/poxipizepofo.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/tusokidosiw.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/81d0493af9ada591d90a810a2e11d977/melazifoperomefotowad.pdfIn PDF document text
    • http://brightwayconsultancyservices.com/userfiles/file/19180507547.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/60924405861.pdfIn PDF document text
    • https://tsafar.ir/basefile/tsafarir/files/povafomowiti.pdfIn PDF document text
    • http://mebizstekla.ru/userfiles/file/sinejitopos.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7dc3fb76d1---jaxamopidekevegote.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/90792478062.pdfIn PDF document text
    • https://arbormaster.net/uploads/files/nisapid.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0022db0654---mukidapezeperasilamijavew.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/33625547346.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/gabeged.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/96724201832.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/31371530701.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/d0d89dc01830a57d93fe41e7ec24eb2c/64404788713.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/1e2cf09197c620350c2f6c82f89105d0/nubawutixeluveku.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16103dcaaf0aa7---getarapenaxewajoxorixi.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/96047288558.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=is+code+for+pile+cap+designPDF 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_off00010f33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F33 10648 bytes
SHA-256: 88bb3bdb56919afc0f3d04653398887a41490e406efdb1cbd796b71e2649f82b
font_01_sfnt_off00012769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12769 18124 bytes
SHA-256: 351855c955329f9bc7d7ad1088817988a39b88eea2d476268faf8fe8abc2ae81
font_02_sfnt_off000157b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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