Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7f4dc2b36c6744a…

MALICIOUS

PDF

108.5 KB Created: 2021-07-25 04:46:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f3d3e33a4cacf64cae4f3e0dd6112efb SHA-1: 6c2493db00518118d755319e2ce888ad9d0554d0 SHA-256: a7f4dc2b36c6744a383c2c9ef93468573bb3ae7cd95fbaaf8f437d7d7f522cb7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of multiple external URIs and link farm heuristics supports the conclusion that this document is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 http://biirbeh.mn/images/content/file/81093439853.pdf In PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16098660452759---wepawawobawubalebogaw.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/3430497550.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/55739325541.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/bamewolefowosunezizo.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/339i0hd0p2vob9fda7ut1v2mvl/11971769048.pdfIn PDF document text
    • https://wagaskar.com/media/kutudosapudaxemimesu.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e311e2e2956---retesoretuwesuju.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/21032098541.pdfIn PDF document text
    • http://novichiha.ru/pic/file/nojudaruvava.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/c98c7ce44683f63d99e2d22ba44de2f9/xemuresuweto.pdfIn PDF document text
    • https://cherrychile.cl/cherry/uploads/contenido/files/18894367524.pdfIn PDF document text
    • http://loaamtran.vn/files/usersfiles/files/fobofumijugumosunijodunel.pdfIn PDF document text
    • http://aclamerica.com/customers/CMS-IMAGES/file/9584458127.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608074d08df65---pepipimurowokolurijunop.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160753431db714---36497816577.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/57724589e279eb53c91dc78fec9b5d77/lodasarotapavapoj.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b13fc5dc6f1---vexun.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae65d96339c---70973926695.pdfIn PDF document text
    • http://bi-acaovo.com/upload/files/zewizamakusawuza.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8118ca2f5---naluxijemu.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/a6d69f00bba01e7123b391ef236aeeb4/75259134043.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/77768305024.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=fulton+j+sheen+books+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_off0001462f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1462F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015e46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E46 10680 bytes
SHA-256: 26b55eb6f270e5284c44701f26c961dd6909e9605c7ea36860f08e256833238b
font_02_sfnt_off00017680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17680 17900 bytes
SHA-256: 019c8cc4e5863d94b521e70f677a15bc5b89db81da00e57420e755018af78ab7

Open this report in the interactive analyzer, or submit your own file for analysis.