Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f51ad3f71b83d6f…

MALICIOUS

PDF

90.1 KB Created: 2021-08-15 12:00:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 8c8b4eaab4cb8f1e5ee7cc9703b4538c SHA-1: ac8f2d6ccfa7162199f5b6f8e8eec58370473f1c SHA-256: 9f51ad3f71b83d6f9f5eee09168ecf186b657a741767f006f38a72f9bd7a0846
176 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 0.9905

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://t2sc.me/userfiles/29888051136.pdf In PDF document text
    • http://healthywithhart.com/res/file/34641722163.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/xinesobutifemaf.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/b5o0kt4qfdh6dr3c7sv2grprn3/74928197705.pdfIn PDF document text
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/67827177981.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbea72c049---guvovawezupufomenusagidiw.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/xogaritaforukaluzaleloroz.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/2105170358387290577r0hto.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/24af4248f5338a2bd01af74ec2e18f3c/51373680263.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/ralubewogezasejopubebofid.pdfIn PDF document text
    • http://feast.to/upd_file/71580892129.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1610a5c52acf91---34238618171.pdfPDF link annotation
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/8smo31t5aj0hjk56u13fbeq7on/venoweduwebisanaziboruxob.pdfIn PDF document text
    • http://huntland.hu/upload/file/xadibenanu.pdfIn PDF document text
    • http://1984wnhs.com/clients/2/25/250e0aaa51dad033202e6c34d8602b4d/File/zumabifexovamap.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/94458739449.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202108/file/68791235938.pdfIn PDF document text
    • https://self-storage.sg/images/uploadedimages/file/75684830230.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/61520559901.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/040f63064d230444ad0437f6e66b649e/97710194374.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/tusam.pdfIn PDF document text
    • https://ewt.cz/res/file/8465808195.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/1fcb0069123f25335d0f338484b046dd/29233147316.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f76a643e70---segasojes.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/o8g9olevjiirq1rcn654qneu74/nuxemipemu.pdfIn PDF document text
    • http://7gking.tw/upload/files/94478542245.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/39484980758.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/59bd3a7e2629f5a1f97e2fac2bdd0f38/zatofezowidisega.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=active+and+passive+voice+practice+pdfPDF 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_off0000fd13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD13 17112 bytes
SHA-256: df0323a433dec827b0fce1e8a3b431dc3eb8212a20825f0137dc86cf6777e244
font_01_sfnt_off00012982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12982 10616 bytes
SHA-256: f9983a258da756073607d3895de89ab0d3cf24c9a77ee087c18389db8cd80889
font_02_sfnt_off000141fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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