Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fc8db394bba8597…

MALICIOUS

PDF

70.6 KB Created: 2021-09-05 07:34:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 767fb1015f047a91075c389b4d5a49ea SHA-1: 34c9c28538244084ac1e282380a3239963af7d3e SHA-256: 7fc8db394bba85977ba946d3c231615593457e500745a876327b2d9aa09c7765
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. It contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for direct user reading but rather as a container for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://merklink.nl/site/data/ws/files/42978520709.pdf In PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/17308f2792f42f90429e9696837dcd70/zusumabufotifiboso.pdfIn PDF document text
    • http://millecolori.it/images/file/sevupibupipebanululefiw.pdfIn PDF document text
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/fidinegoxa.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0045561884---vatagaxunokarofajabobin.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/makuvisededofuno.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/rasobuvolun.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161062dc53ad36---51000801450.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16098bd610cc1e---pevimugewugatitedorajowi.pdfIn PDF document text
    • http://atallmed.com/userfiles/files/nozuzofexeduxosisako.pdfIn PDF document text
    • http://atomleasing.ru/media/File/49964741616.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/fupemezijebulaxuda.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/b76580ad3aead009508b404d4ca902cf/526718712.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/5dde353257eccf64309caf80bd523fdc/43118408645.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/10261523477.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/10808549406.pdfIn PDF document text
    • http://lyshiying.com/d/files/66380088209.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/40069043700.pdfIn PDF document text
    • https://kfmaccounting.com/webroot/img/content/files/48888760667.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f428b5e6e8---miwisatabano.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/66735827160.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/15745329404.pdfIn PDF document text
    • https://andrejc.si/files/file/gafibarivurilikepiwuvu.pdfIn PDF document text
    • http://pahsclassof2005.com/clients/d/d6/d61c4c031b0f3af13d3e88110ef3a3e1/File/53364809982.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/fisiluvadu.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/05/29/file/20210529_155311_138.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=cv+format+pdf+for+freshersPDF 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_off0000b772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB772 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF89 10616 bytes
SHA-256: 07cd5544a0a1309ac808a5a0fd02c6cbde9044b949518fe01cd721ae23524a1a
font_02_sfnt_off0000e7ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EA 15000 bytes
SHA-256: b2216af4668a8910916571e0bc10e6d229c880a0a21b655508f2ff9882e62b53

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