Malicious PDF — malware analysis report

Static analysis result for SHA-256 a914723622839c2e…

MALICIOUS

PDF

69.9 KB Created: 2021-09-27 15:22:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2b87adb9c69c5a1d4eae59c8edb71b03 SHA-1: 5d8f60b609d3fee35bca3097ab851e99ae55e558 SHA-256: a914723622839c2e21ca27f2d6ff92dc9abf59a82a9b5249c2eff5a5a9e2c5b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, some of which are identified as compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of external URIs and link farms suggests an attempt to redirect users to malicious content, potentially disguised as software downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://tbff-bygg.se/img/files/wigunedesobezema.pdf In PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/78799527030.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/bamafejotuvupogamexe.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/liwuduvewokozazulapej.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/63453329980.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/zokefinulum.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/23346150842.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376ff14d281---razujadodagad.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/zanikavofamadivarumixisu.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614fa6948961a---82574000970.pdfIn PDF document text
    • https://hobbyschuurtje-webwinkel.be/images/userfiles/file/68858953872.pdfIn PDF document text
    • http://klwas.org/userfiles/images/file/gazisanu.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/99173372314.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/c3mu5rmlv2haslkfjf2m6e2uge/sofifilopuworovivuguzoru.pdfIn PDF document text
    • http://potya.com/banutabasopibovudufo.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/sapopawopanisowidezomakut.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133bf8faea7e---munumufaboxafiro.pdfIn PDF document text
    • http://brukikostka.pl/uploads/page/file/xuvopasumexibiladix.pdfIn PDF document text
    • http://vpsystem.com/files/fck/jevobibutalil.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/26794764412.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/45030086618.pdfIn PDF document text
    • https://sesconbs.org.br/ckfinder/userfiles/files/33026934062.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=cooking+fever+apk+mod+downloadPDF 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_off0000b101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB101 15792 bytes
SHA-256: 0a50b56a33d9c957752f2f067d508b0ab79372115c405ed7ec6dd593f4dfbeff
font_01_sfnt_off0000d8e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E4 10852 bytes
SHA-256: 8613ce9785868695b391aa4d4e7469c9f694c99172c023692c58b85eeff54109
font_02_sfnt_off0000f1ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1