Malicious PDF — malware analysis report

Static analysis result for SHA-256 41467a83079956c7…

MALICIOUS

PDF

108.9 KB Created: 2021-06-29 06:13:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 2394fe5b2061162dea3a2fecefb8e7cc SHA-1: bf638bfe0b8c3af264f69fb69736d31581adcd57 SHA-256: 41467a83079956c79a53d2bbbd37d93add7409744f8d7a4ec95128760553a8f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The primary attack pattern involves directing users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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 http://paillasse.hu/userfiles/file/lavinuj.pdf In PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094dedd70cac---rujasilowenarivuw.pdfIn PDF document text
    • https://vydavatelstvoklett.sk/userfiles/file/93777901766.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608835d3e44fd---daxufezuwowokividuwew.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/raous3mne614fuc6677rf8gu60/42606359748.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160805c28bff55---81719391456.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/jljjp0guth6mmd6r05oad3ti50/putopemozebez.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/i4u33l9i1j31uc30c60ntb47h5/81864540426.pdfIn PDF document text
    • https://midasspa.com/ckfinder/userfiles/files/5175262984.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/zufaxulafidowamakamadika.pdfIn PDF document text
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/b53ea65add5940a6eb1c005905d21a48/41130982073.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e924f11b8---neninavatepubesaj.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/xajefibupenudaze.pdfIn PDF document text
    • https://mimpiindah2.com/contents//files/64185964153.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/ac03e886cdef23721f4b06cdaecb28bc/rumozulibopovut.pdfIn PDF document text
    • https://chris-arnold.com/userfiles/file/tosixowa.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d83c54548---86823470584.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/vuxib.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///93789661808.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/18238850167.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/989355b6a8552da2fe31feb5a7da8a28/42427433699.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=kevin+evans+sheepdogsPDF link annotation
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/tumiwo.pdfIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013e57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15669 17240 bytes
SHA-256: cb771a5e732e8715232484d44ca9700a17bc6334bf9ea2e50b57d81ee8777964
font_02_sfnt_off00018342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18342 10484 bytes
SHA-256: af86c8823f4258b95371385fff0444034a142568796b6c2fc2ff2f72fe40b196
font_03_sfnt_off00019abe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19ABE 2232 bytes
SHA-256: 58a0188de5d91bb094fcac15928465056ef38b43cae48a21cf8fe5375c8f5ebc

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