Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c563a646dab8ce9…

MALICIOUS

PDF

82.0 KB Created: 2021-09-18 23:47:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 89686269e9e2c938594870dbbb22ffc2 SHA-1: dd1d8f864862788434ad3ae0fbff38484874091c SHA-256: 7c563a646dab8ce969f83bff9527e48ed2853ecf4de5ce3203aa05295bd73081
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting an attempt to redirect users to malicious content. The PDF structure itself does not contain executable scripts, but the presence of multiple external links indicates a likely phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://pijntherapie.be/uploads/files/japivibirilawisatalolo.pdf In PDF document text
    • http://abw10thstreetne.com/uploads/files/jutiwuz.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/3a82935204e030feb321d7def4a9270b/woxudegisuxomir.pdfIn PDF document text
    • http://tahyuh.com/uploads/files/202109172358504593.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144e792657ef---diperomadumaraludarexuzo.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/49396212085.pdfIn PDF document text
    • http://nobody-films.com/bpms/includes/fckeditor_uploads/userfiles/file/bepozi.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/62202910525.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/luleponilev.pdfIn PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/jopojusanilugimo.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/ctg01mjs3iijvl6mgqc51mgi46/68611290186.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/a2a5p8lq8fileieki0hei7u675/54016707032.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613a539bc394d---25508935517.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/73411802495.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/didiporodosemaredopuz.pdfIn PDF document text
    • http://www.miyadenthai.com/image/upload/File/4344302802.pdfIn PDF document text
    • https://worldpigment.com/image/upload/File/xejawexesaripusoguruximaw.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/kepip.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/420f002cd9ea49d35251bc8ff905513b/97382278563.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/30635459785.pdfIn PDF document text
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/lerujawap.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/ghb5u58olcdntar0nsnh9mcfc8/zupexos.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1613c81d676759---vejomunejazozilu.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210913_EC87D42956E05B96.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16134b8cc0a654---97011824747.pdfIn PDF document text
    • http://olgapolyakova.de/files/files/47320350356.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=the+immune+system+parham+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_off0000de4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4D 16664 bytes
SHA-256: cba9d31aff2dadd52658ab4a9870185a3d60278854f7f36e07e262cf73af7e76
font_01_sfnt_off00010956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10956 10772 bytes
SHA-256: 7ad499a8ce80bb1693a321c4f404595d2ceb7d8ea3fa5f061f87661e1f3fb3b3
font_02_sfnt_off000121f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1