Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aff37b29e23f406…

MALICIOUS

PDF

79.3 KB Created: 2021-09-07 23:03:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 939b5c6727cf5ca4287fd5907444ec10 SHA-1: 93e812a67bba414e5aefafba7daaf7d4dae792be SHA-256: 4aff37b29e23f40689f265dd7082b9a463402837faa89bbeec7b59d0c4b20f55
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised websites and potentially malicious PDF files. The presence of multiple links on disposable hosting and compromised CMS upload storage suggests an effort to distribute malware or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/8dd519acad790163eaa3301c327e7539/gisobosufaxumelob.pdf In PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160720ffed064f---14951988173.pdfIn PDF document text
    • http://granitemountainranch.net/userimages/37994060843.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/kiriwefateginilu.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/bixiberinebimes.pdfIn PDF document text
    • http://zonweringbelgie.eu/ckfinder/userfiles/files/giriwagidupexoko.pdfIn PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/jojinarirukugunolaf.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a30d04086b---zovevesevumobuvofulexa.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/82381fd5d806b9f62806e7e51f6e0860/pononavimilafiga.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/35584036795.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608aea8b6a265---nejomiponewevenokut.pdfIn PDF document text
    • https://maintogelonline.bet/contents/files/parukojok.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608277a1da57f---92141221658.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608365204ac2e---rovori.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/sixatudojusofipor.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/386b49a95fc1bc42ee20fb6a81fe6d4c/89831519020.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/77212241412.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e33876d349a---dukepepidejigelu.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/72317392103.pdfIn PDF document text
    • https://healthtecindia.com/userfiles/file/4514570493.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8d8317b00---zajugopovaruderofi.pdfIn PDF document text
    • http://reliancefla.com/admin/images/file/93733762652.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/24065856660.pdfIn PDF document text
    • http://gachtrangtritranvinhtin.com/gachtrangtritranvinhtin/Images_upload/files/mivarakojedilizep.pdfIn PDF document text
    • http://iworking.vn/uploads/files/226154497.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021629817431387.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=comsol+microfluidics+tutorial+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_off0000cf34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF34 10676 bytes
SHA-256: d9653ee57f55064a92dfe63db88ca934a57993c732e80c660bc7077c92ecbc93
font_01_sfnt_off0000e7b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B4 18192 bytes
SHA-256: 9724ea2b4f25f125d578b6030106c0523109b9f0117399a11b59a37f8272eb52
font_02_sfnt_off0001170f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1170F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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