Malicious PDF — malware analysis report

Static analysis result for SHA-256 561749347c31f24e…

MALICIOUS

PDF

74.9 KB Created: 2021-09-02 05:45:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 99c57619e58408cde46ff22bd3e65c85 SHA-1: 4a5b9a614736969cf8205017eaddf2bf7c1d2caf SHA-256: 561749347c31f24e191118ceae942e2db46e0784d90352ba3ca1eb24bfed5558
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifies this pattern, suggesting the document's purpose is to drive traffic to potentially malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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 http://lamorenj.com/userfiles/files/19004786016.pdf In PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee8cf86a22b---77327551260.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/batitepowupakotopema.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a0006b28f51---82327487442.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/45446170196.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/gu8chlukimq3va7qte1va72qob/fogolawijuvuripowejit.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/11753667810.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/52978242747.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/35b72981b5136e36a31dbf81e67d27e6/jalodezemapamupo.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/detajizog.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/52510563552.pdfIn PDF document text
    • http://nova-auto.com/upload/37974301688.pdfIn PDF document text
    • http://bulmarconsult.com/files/zomavelejixatuvibenex.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a7c7a231e---bunetokaxoba.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a431464e91d---nufokilajejadenoba.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/66289071637.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609286dc7bf14---37197739833.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/pefin.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/86299258838.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6470fabf35---63245728264.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/1a5e02e91f34a1185e06565da418d339/jivafeverotimowogene.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160736f27991a1---niwor.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/voruzevogumumos.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/89189022083.pdfIn PDF document text
    • https://jin-ji.com/upload/files/44337348605.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/xapisivoxatinikoxuxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=chemistry+class+8+notesPDF 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_off0000bead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEAD 10848 bytes
SHA-256: 039593c9b8a2797dff07ccde6e10a66df1a4aba85b88a119dfe8dda62ac03b76
font_01_sfnt_off0000d796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD796 17552 bytes
SHA-256: 72a9e053e43dc5ebc28922e5836049650757073c39cb45c575f0fe983b27d033
font_02_sfnt_off0001048c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1048C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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