Malicious PDF — malware analysis report

Static analysis result for SHA-256 82d8064fd849350e…

MALICIOUS

PDF

87.8 KB Created: 2021-07-06 19:21:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6e115399a49c9be295eac0c79eeeb741 SHA-1: 051ab893d11e91fd7d959c057ebb144bf8678b8e SHA-256: 82d8064fd849350ee91e62465dae9c5484a08d8a0686ebba455aedae0f0ab824
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a high ML score and ClamAV detection for a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of external URIs and link farm indicators strongly suggests an attempt to redirect users to potentially harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f09110cb37---63788251637.pdf
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/68b38c0eb8c005f7c106da7b50da542f/58857774649.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/bu7fumq8d8hg8g5qs9ma297381/17053433462.pdf
    • http://veterinariacasettamattei.it/userfiles/files/6350316587.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/50s5vupcr1rs5sugrmalccpkfr/lovuwodejaxosibiluvo.pdf
    • http://kapli74.ru/upload_picture/limikisunobaxamoza.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ccbe61fae---buvanakafiva.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a61d07f2e2c---konuvafikikiwonerugaxuk.pdf
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16090a8eb23a4e---31891742310.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0aa81ebd31---37084073051.pdf
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a7786003b9b---22139715219.pdf
    • http://bukharaatlanta.com/sites/default/files/file/zesavegirobimekonili.pdf
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/p48ajpbjibh537902d8pp956s1/64794106668.pdf
    • https://geneolock.com/locktactyuma/userfiles/file/batupatiwufamuwuva.pdf
    • https://ayurvedaemart.com/uploads/file/95144362884.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7a67557d63---9231549452.pdf
    • http://artospace.com/pics/file/95319057013.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16070565b61896---14896490716.pdf
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/38139796950.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d74b6efb1e---jolufabokupesubejejaliwa.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16075e0b6d3ed2---15759844609.pdf
    • https://cambodiaangkorhomestay.com/userfiles/file/jegiwunesudavekaj.pdf
    • http://przychodnia-felinskiego.pl/uploads/editor/file/segumizirobonako.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc9819de7a8---sogop.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/73954f25bb5b4522cc6de8b07e8a7278/masolato.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=tamil+dubbed+hollywood+movies+full+movie
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f02b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF02B 16792 bytes
font_01_sfnt_off0001083d.bin
26f2e1e2ce71f0ffe5640c6f149d9953948dc557ed557d1226cf88c94963c3cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1083D 18292 bytes
font_02_sfnt_off000138ca.bin
6a4e6f1132321ce4adcc0301545e8622eface33fc94d07f493ea27bc3b5a0bd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x138CA 10788 bytes

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