Malicious PDF — malware analysis report

Static analysis result for SHA-256 16643e860ee4dc4e…

MALICIOUS

PDF

76.8 KB Created: 2021-09-20 12:03:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 38b8a734e9a8f63737d31a57243948eb SHA-1: 46d49dadb367e40395fe3c58ed7d40cd797ed125 SHA-256: 16643e860ee4dc4e8862bbb971b284f357c5ca9a2dd6766c2dda1ec957ad9690
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://cructi.ru/uplcv?utm_term=netter%27s+head+and+neck+anatomy+for+dentistry+3rd+edition+pdf+free PDF link annotation
    • http://runhouchem.com/upload/files/61823002609.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/lokitukumugotebixepizogij.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/7721086021.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/talotalivuvumisejosini.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec7a947bac---rojozemujima.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/xisag.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/43957329023.pdfIn PDF document text
    • http://zkpower.net/upload/files/lovuzanoxumunajixujizal.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea07eecae6---91855995625.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613d75ec541a6---97569945574.pdfIn PDF document text
    • https://ever-progress.dacola.com/upload/files/65537467325.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/23893920670.pdfIn PDF document text
    • https://wittnebel.dk/file/47856925769.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613a20f7e805a---fovajeselobisejufajefom.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133dc06e2415---21640580834.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a36af25861---93428514226.pdfIn PDF document text
    • https://wrd13.com/force/file/92393414256.pdfIn PDF document text
    • http://www.perchegouet.com/ckfinder/userfiles/files/lalemorakapipajonit.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/33338862899.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/biwirupusus.pdfIn PDF document text
    • http://koala-al.com/d/files/29279960952.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/82ad2fa9c0e63d57ebb8b968e15c62c2/feretebuzoj.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/6138357470.pdfIn PDF document text
    • https://magatek.com/documents/file/16395264340.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E4 17120 bytes
SHA-256: 1fae4fefcb026ac501a9a6c12027413cd64fd1b5b0282c8a8e04ae16374496ee
font_01_sfnt_off0000f236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF236 11228 bytes
SHA-256: ee00d773d8e538d9aa354cd93dbe1cd3134dc56216dfcb14c75d9bf8d04ebbbd
font_02_sfnt_off00010c7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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