Malicious PDF — malware analysis report

Static analysis result for SHA-256 60fce79823161f5a…

MALICIOUS

PDF

79.5 KB Created: 2021-09-05 20:55:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 48cfffa9479f966d36c540ddcdc11524 SHA-1: dc24eadfc75ab4c2eb3bba72f2376ce3d8ae4278 SHA-256: 60fce79823161f5aa434934ec00efd86ae39fe00124a752df95ad5856a8c11c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The file's structure and URL patterns are consistent with a link farm designed to obscure the ultimate destination and leverage compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://refpecsbelvaros.hu/kepek/files/4948230337.pdf In PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/a1846b6a203f66e1b6db0944ea5ef16e/30097027097.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/s6pahuu47nol4i8takrjiqk0a2/4323223.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/9676562196.pdfIn PDF document text
    • http://18554080.com/userfiles/file/musoza.pdfIn PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/jibonefelobubutasajef.pdfIn PDF document text
    • https://sce.tw/uploads/files/60f4459966600.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160a918fea1b8b---68726868419.pdfIn PDF document text
    • https://sharenkon.com/files/36511034739.pdfIn PDF document text
    • https://badoza.net/userfiles/file/82068708881.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/90166850787.pdfIn PDF document text
    • https://davaocarrental.com/images/file/83695339508.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff196cc586---nigupomexorimenoneso.pdfIn PDF document text
    • https://eternalbliss.net/file/8883650383.pdfIn PDF document text
    • http://xn--2o2b17g32e8xisqq.com/userData/board/file/81067980939.pdfIn PDF document text
    • http://www.buildingmalawi.com/images/uploaded/documents/kisikudazi.pdfIn PDF document text
    • http://livinglearningandworking.org/clients/e/e0/e05af8355f71d8da3aa90f500b9284b3/File/62670450761.pdfIn PDF document text
    • https://vasantviharproperties.com/userfiles/file/kuzuneka.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/poguxurov.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/79d19fdd4cb87a1bbee83e8a89059214/didiviruza.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/45513806737.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/80687749580.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=could+would+should+worksheet+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_off0000d4b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B2 16892 bytes
SHA-256: c09d22ecdf971fe7c3598b2348b0b07125d69335ac28580cdb5f847254a06cf9
font_01_sfnt_off0001005d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11874 10548 bytes
SHA-256: 940a9a751352ffdbc44bde25fdf061e7a084af361b16fe28f1fdfa5171c0e1da