Malicious PDF — malware analysis report

Static analysis result for SHA-256 3200ea594898b6b6…

MALICIOUS

PDF

69.6 KB Created: 2021-09-27 15:57:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d321dc88c4bfafcdd9a6c7852d6faad5 SHA-1: 55c25464e668ec327518e9356b64c64386169cb8 SHA-256: 3200ea594898b6b69980c07a118bf97ff8f7c73ef8c43108b13d629a70e6c336
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many hosted on compromised or disposable domains, indicative of a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the nature of the PDF and its numerous links align with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://pistant.ru/uplcv?utm_term=como+configurar+email+hotmail+no+android PDF link annotation
    • https://footballsod.com/images/ck-uploads/files/zejuxuzo.pdfIn PDF document text
    • http://lsmtrontractor.com/upfiles/file/20210905001714.pdfIn PDF document text
    • https://www.esfa.bg/root/ckfinder/userfiles/files/nodamokat.pdfIn PDF document text
    • http://sportservistocik.cz/UserFiles/File/52816064360.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/9b8d117ee5a79d2e4466d1cf88cbbce2/tuzulujap.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/zivuvokaka.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/88632526878.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/rijesu.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/97144272139.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/99140965641.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/7ejef775or56dnp0m92e67si33/89419157719.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146f402d2e21---taladijew.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613011f034e58---lavevatamuvepodofe.pdfIn PDF document text
    • http://appextskihjthj.handysociality.com/upload/files/57104110287.pdfIn PDF document text
    • http://bckbytow.naszbip.pl/img/upload/files/3782772657.pdfIn PDF document text
    • http://resurrection-life.net/userfiles/files/sozoloxarudiwudosugeze.pdfIn PDF document text
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/8437741668.pdfIn PDF document text
    • https://youxsoft.com/uploads/files/wewub.pdfIn PDF document text
    • http://coverybox.box8websites.com/ckfinder/userfiles/files/24721006818.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/161317809a7679---luket.pdfIn PDF document text
    • https://elemental-ia.com/userfiles/file/fatira.pdfIn PDF document text
    • http://kezmosas.hu/files/file/jubosurulabezizu.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/ropijeporiluvopogax.pdfIn PDF document text
    • https://drhuanghair.com/uploads/files/202109021214103198.pdfIn PDF document text
    • http://grafittipng.com/userfiles/files/pewajujujukerevawen.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/2350257485.pdfIn PDF document text
    • 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_off0000b146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB146 15116 bytes
SHA-256: 9f93dfd524ee34800a27604284d0a02a33e68316d237bc4188ffac4ada95bafb
font_01_sfnt_off0000d778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD778 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8F 10888 bytes
SHA-256: 955e558d5dd1c71ce915181ea88ae2466e44deac6bb3b284dc4a358bf27e9675