Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9b385e20cd8430a…

MALICIOUS

PDF

82.8 KB Created: 2021-09-05 22:28:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ae58495b8c6099d7252dc48e532635db SHA-1: 3299729711c283d31286ecb72a19a6881b76446c SHA-256: f9b385e20cd8430af1ed974650e8916c23f2caa36fb3afd3334728ecae6526a1
176 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms or disposable domains. The presence of numerous links, including one pointing to a raw IP address, suggests an attempt to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/7748fb8099b87cf6e49185d9adff18dd/jerodevakuj.pdf In PDF document text
    • http://files.ibiza-ferien.de/file/57071912196.pdfIn PDF document text
    • http://140.121.161.111/ckfinder/userfiles/files/tidedobibuvixadop.pdfPDF link annotation
    • https://mebelihome.ru/upload_picture/41679295182.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/41025104519.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/f619c55b249bb4f04e05fd256448db94/12573506692.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/paximopozepanenozuferiw.pdfIn PDF document text
    • http://gardatrans.com/content/Files/xavogonakuzogifupufujegi.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/da5c78b288e5b52b48106d9187fd38b3/90941078204.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/fanodinemojinajutubopu.pdfIn PDF document text
    • http://sedaciesupravy.sk/media/file/neruxetikejelivet.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/83018715897.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/40a46097a0a2d11e6bace2f2413ee1d7/wojobesovazosebux.pdfIn PDF document text
    • http://thegioioto.store/upload/files/newurofexi.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160bfcc72b3a96---31990111784.pdfIn PDF document text
    • http://magyaringatlanadatbazis.hu/dev/_user/file/didowivoragaf.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7d82c830ac---joserotakalavowopi.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/waraxuxusutodesurebof.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/9m2gav7k2l376e16frrdcttcu5/89054383498.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/39d9adfe88151e8f912ad347e0ba0e82/jukiwiruvem.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c05f95e5549---befulijoverakunisijaki.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/47339888139.pdfIn PDF document text
    • http://thienanglass.vn/upload/files/45928941917.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=proyecto+de+sensibilizaci%C3%B3n+ambiental+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_off0000d991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD991 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A3 18532 bytes
SHA-256: db4654e18e69739d72062104a39e15e44d80fea1e743f8e2307fe01bef323ebd
font_02_sfnt_off00012119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12119 11232 bytes
SHA-256: 104b5202651f5312e359e82448b3233f054cb90e81deb91f534afdd706c4b26a