Malicious PDF — malware analysis report

Static analysis result for SHA-256 07fc91f3e535026d…

MALICIOUS

PDF

73.0 KB Created: 2021-09-01 16:06:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: a5bb51c280f03e16f7a76c336640a694 SHA-1: 7c79605bf62bdbaafc36d0d121f3c08d05528811 SHA-256: 07fc91f3e535026d45610fca84da2c7f6b6229cb3d9018cf35febc0f19934c50
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/f6c775dca7b8a01009910303f70006eb/xejep.pdf In PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/36713893450.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/rajarasirisopelizo.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/8b64987104de7b3cc991a0d245b532f5/vapaturanikowukizo.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607dcdbcd29fd---47898209779.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce8dcc56f3---53587734244.pdfIn PDF document text
    • http://www.heksan.com.pl/file/rituzafisoru.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/90627789838.pdfIn PDF document text
    • http://pajurioverslas.lt/ckfinder/userfiles/files/95819202929.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/suvuvokigifexuv.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/v2jlf34orjar4l67aq0mfopt56/92956788647.pdfIn PDF document text
    • http://eis-pieschel.de/UserFiles/File/29239182318.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/u6s5vt2aas0grp5mjb4ipa2926/lozifemetig.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/jiduwuk.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16081969651fb4---87427747126.pdfIn PDF document text
    • http://viorina-deko.com/images/file/nesujakofeji.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/86586963712.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/1943da70ea545edc3814b81d1298cd20/vudilupipafap.pdfIn PDF document text
    • http://htygroup.com/upload/files/86368572703.pdfIn PDF document text
    • http://pololanna.com/user_img/files/libojuxavakamuvoru.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f836cb735b---kejesukel.pdfIn PDF document text
    • http://nocleginaplus.pl/uploads/userfiles/files/mevipowadexovafilupubu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=congruent+obtuse+anglesPDF 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_off0000bcca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCCA 16380 bytes
SHA-256: 3958636fb759a9017ea35540be495904fd58e2cea984a90b3c2a0aa08ed8b243
font_01_sfnt_off0000e6ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AC 10464 bytes
SHA-256: 7a17df389cb937f56b4ad6ef8189be5d2ee67d85b2ebdeda4062cf08ba8843f5
font_02_sfnt_off0000fea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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