Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fefd826e8e7cbf3…

MALICIOUS

PDF

72.1 KB Created: 2021-09-03 07:01:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9b1ddeb945e528ef0d43cde0cca15e5a SHA-1: cbe38ba717b525952d98daa7b660b5d72930476e SHA-256: 3fefd826e8e7cbf3bd3de5a1794b7e65d0748681d035cd6ef2d7f3185ca37782
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://1utilaje.ro/mm/file/banexivebitaxabudevolugu.pdf In PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/5uk7gqdf0pk4o2f33qb2g9fme3/90953336614.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/70ef9b2014c979148eb0048fc71dbfc7/91044017287.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/i7flff5nhk84v313umvs7qno36/xixavazem.pdfIn PDF document text
    • http://smeclassof1987reunion.com/clients/37165/File/rofosirib.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608503c032f84---zumoxidoji.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/61860716261.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/36b8781ec7a7a56933bf6f0b8b1901a5/suwawibewajebiropo.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/37194930.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/te0ptous27pdidvn95gg810r0f/weputimuxutoxemubezer.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/panitofum.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/33779765239.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/ce481ed4c66ebb878a22293883352168/91521883408.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8ad4097950---21732962330.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/b595c3f9d6fb1a6f24e5f5fbd0496d8c/17251321206.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/11635d96e23c91d5f579dea46ebd4b65/gogevuwi.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b33eb813ac1---larerinilu.pdfIn PDF document text
    • http://riversedgefm.com/files/file/temamitifukuk.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e6059ddbb---91929146884.pdfIn PDF document text
    • https://safehouseservices.in/fckfiles/file/zawifat.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/72526813576.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/lawalokafefebom.pdfIn PDF document text
    • http://beiks.info/public/file/mopulozotopadufimunoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=proper+nouns+quiz+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_off0000b957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB957 16436 bytes
SHA-256: 129bced9be153524dac62cc9f61744a1f57f2b7c22998aa79ea03c9a66147fae
font_01_sfnt_off0000e3a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A4 10492 bytes
SHA-256: 7a1d39a7281ac1f9e565b9bde03690836955f0fc0ad7376e848c222a8f7cd8b4
font_02_sfnt_off0000fb5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1