Malicious PDF — malware analysis report

Static analysis result for SHA-256 f06391e88aabba22…

MALICIOUS

PDF

70.1 KB Created: 2021-09-17 15:59:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: acdcefb14a1300cce0299bb06fdae2ad SHA-1: d7d6fe68ca666e0d86b8d61ef971d9c4dd9b1c2b SHA-256: f06391e88aabba226635f2032be533f0eac941a4be234a3dcee54a84295d106c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to compromised websites and disposable hosting, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload is intended. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://cructi.ru/uplcv?utm_term=jailbroken+apps+for+firestick PDF link annotation
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/3e0c28bc8d476652995a0990df667e6a/xutozegovukazitit.pdfIn PDF document text
    • http://bonezi.morefriendship.com/upload/files/69376192709.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/0a85ead5214078d32b0a0e5f61ace1ab/tusulenesonedonek.pdfIn PDF document text
    • http://bastola.org/userfiles/file/jilivonabotijugakazuwobux.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/gigataxokipizelomebu.pdfIn PDF document text
    • https://lacgl.org/upload/editor/file/kodurigufuvitawag.pdfIn PDF document text
    • https://marsanz.pl/uploads/fck/file/39863871032.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/11819581021.pdfIn PDF document text
    • http://totoumi.jp/upload/file/98493495635.pdfIn PDF document text
    • http://berbun.com/user_img/file/32660027183.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/4027478391.pdfIn PDF document text
    • http://guowangcable.com/d/files/48969633622.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/93026139564.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/61932029761.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/2e445dd24f4e3591a477c6fe13f7a89f/dedizipokigutunonugizo.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614352f507b79---435718793.pdfIn PDF document text
    • http://matrix-corporation.com/upfiles/editor/files/ludirujijuwijatizetu.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/gulivofolibifogobamisud.pdfIn PDF document text
    • http://zkpower.net/upload/files/54815505282.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/wigugemobilepemi.pdfIn PDF document text
    • https://idea-web.ro/app/webroot/files/userfiles/files/sapukorezunozozumesabozok.pdfIn PDF document text
    • http://colantuono.it/userfiles/files/94219960575.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_off0000b457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB457 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC6E 10696 bytes
SHA-256: f5fe2ec97abf5f28b08e8258f1707d9d68d9b1717eb0d2faacef40fa8c2150ea
font_02_sfnt_off0000e4dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DC 15128 bytes
SHA-256: a84cfd8a11da9703ec02817553fd4d035154407bc98a8f702d678120d9ed61b1