Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef938f132cbaf38c…

MALICIOUS

PDF

85.9 KB Created: 2021-09-04 07:55:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b15610a9eedd24e7c2f29b896f2ce451 SHA-1: 8435b7b626188103d1f1ccc6ac216751448f704d SHA-256: ef938f132cbaf38cbf88e509e2cf7fa1ae69bce99fd547ed3f3ef925930213f5
164 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs that form a link farm, directing users to various domains, some of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ajivikafinance.com/userfiles/file/93265670768.pdf In PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/d07455ded8e772fcce0544830a408e1c/vetadepepin.pdfIn PDF document text
    • https://wildnaturetravel.com/File/14354548474.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16073b22dbebff---68097815715.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/xiramaw.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/10046625182.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/68473448044.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bdd6d5bdf8---xubofulopojobogonuwu.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/6bd443fef0f93f42ce1e99e8e243b40a/rizizezufetopido.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/5b587f8658490978500c0ea1889b077b/sorusetoka.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/4193873656.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210601122712_aeuo6k.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/163a96f3ebe9a37d654d43aaa14301bf/39573906595.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/shnrqf0h5g67rrb7usfago6c7s/90376733075.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16103fc11ad6ca---59085765154.pdfIn PDF document text
    • https://yorapp.it/file/35783569921.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160f3185c48fe0---kaxinodezaf.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/vinozowanif.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/46594961379.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///dubinojuzuvorudetobivumij.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/65744195903.pdfIn PDF document text
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/nisawudomazopivalak.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/jirajir.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160754cbe2d421---vibobolo.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/mejilufef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=gabungkan+file+pdf+jadi+satu+onlinePDF 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_off0000e9b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B2 11072 bytes
SHA-256: 821cdd82fafad01cc4157d6a0b291cf92ed0a3714e6f4c7735df8d0c406c7f8a
font_01_sfnt_off00010332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10332 17700 bytes
SHA-256: f72d4dc232e92c591b9c2bb6cdcc4329670eb4f037a78944b54479f7a8408d68
font_02_sfnt_off00013161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13161 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1