Malicious PDF — malware analysis report

Static analysis result for SHA-256 c370aaa0ad1d786f…

MALICIOUS

PDF

77.7 KB Created: 2021-09-02 04:38:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: dccf067ca947d22e78aaf562cf57aafc SHA-1: 5594ba915e45480ced8fe0210227109bc885a6e9 SHA-256: c370aaa0ad1d786f3dbffffff587235d157764ca40a5aa8e17458157c629343f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the structure and URL patterns are consistent with a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d3f68ff4f---nutipulavukulenifasixetof.pdf In PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/43219112412.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/12796040945.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/89609698281.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/dfe59caef5fd060f6937e3d053b72bac/87288746550.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160e08e19b317e---tojoriteburajepogukibex.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/82151de291922514e854adf80540232c/68782945643.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/69935908324.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/gowuxisaduvukax.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607293a8af60e---zotolakopiludulibu.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/3df64e8a1bfe10e741d8e4cfd6460c85/gikenizorupidewamezosorub.pdfIn PDF document text
    • http://richfieldhighschool1969.com/clients/868116/File/foxigifedu.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/186f0d30bfa232b5d095727610a924d6/73081578490.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/53090460909.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/tirudusitogikixekesi.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16082f0d9d1d26---75201612536.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16091e80c3b333---nibaduguzafuzetuzonoxewe.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/2e65daf13cb301e60930610fa24a60b3/781274874.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/4683319209.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/36591020385.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607068fd7d3a6---mumesejebuduvosemijuzawep.pdfIn PDF document text
    • http://oaklandscreche.ie/userfiles/files/pesubajekevupivizebil.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/5880245956.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16090237dbfdf2---gafeguzabekaxutigelesiwug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=plants+have+both+mitochondria+and+chloroplastsPDF 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_off0000ca58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA58 10984 bytes
SHA-256: b616de2379560241a6aa7d8ba2c8e39086a325005e04e62f26a520c3667e5b57
font_01_sfnt_off0000e372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE372 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB84 17200 bytes
SHA-256: 80ed756f7e060bba3e26a045f0762a20949858b2a192c9baa0b2b0525d0791df

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