Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9ec7f712f245fc8…

MALICIOUS

PDF

83.7 KB Created: 2021-09-07 16:08:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6d9c2e4dc68aec1ce44a2c689ae3d57d SHA-1: 83d350371d4bf54e7cdb21fcc8ef1ece3b4a093c SHA-256: a9ec7f712f245fc843b99163a2c2699ff61f5f8e777d2306f6160185ad95dc17
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The presence of numerous links on disposable hosting and the use of UTM parameters suggest an attempt to distribute malicious content or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://peltonfell.org.uk/ckfinder/userfiles/files/89415479995.pdf In PDF document text
    • https://urbanshapes.in/userfiles/file/21185207395.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/lobotolu.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210808063812_2te0zu.pdfIn PDF document text
    • https://tl-systems.hu/files/files/dumimifiwebesapelu.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/19361261002.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/babikuwijaposigapa.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160eddf52daf40---zujutunofugomadasip.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/safokape.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0c552c43b---94738175519.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/zamejigulak.pdfIn PDF document text
    • https://408of53crownstreet.com/assets/media/files/45341696148.pdfIn PDF document text
    • http://dentherapia.hu/files/file/19400602043.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/m0f12ptcsps628i0te7h78arn7/memigatakabixidato.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/34650246521.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/7bd22eca95b2900240a918103d554d1e/16121642224.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/00253e603ade7caa631df3e5b0611a61/82214278821.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/subev.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c578042644f---8709479700.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/sivetetewoxumosabafobijip.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/62355167265.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/10466702399.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/0c9ccf9914c1c2434f7ba5bc325039fb/68638882145.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210823110013.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/b6f63880e692a7e079f7daa99d3c8173/kepifubodinizom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=seven+mile+miracle+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_off0000e189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE189 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f99b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99B 18304 bytes
SHA-256: ec481ae649dd4f3d90f0c6f5db99a80ee7680048ddfe6011fad2275760c5ecb8
font_02_sfnt_off00012919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12919 10536 bytes
SHA-256: 2943381f804e1550e33af2d60da540f707bd2ff5649d6bd0d0b2bb486dee6194