Malicious PDF — malware analysis report

Static analysis result for SHA-256 8877667e46df659f…

MALICIOUS

PDF

83.3 KB Created: 2021-09-08 12:07:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2eb1d582640fc8fbaf299937c3cee508 SHA-1: 71a73dedaa1bdd79e7f99ac92b3e817b729ce991 SHA-256: 8877667e46df659fa2f1ea2c909209257efd372871e66b34d872bf52c5a79d9e
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure as a link farm on potentially disposable hosting supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/daa89db06163cbb7dc4acaf5c721c04f/rolepiverog.pdf In PDF document text
    • https://cuisinescartier.ca/upload/editor/file/70321718599.pdfIn PDF document text
    • http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/tekebabuk.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/64293077866.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/vilifajajat.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/763651679e9ba4f1c7dcd4b965d2687a/dubimimafamipaj.pdfIn PDF document text
    • http://bigxra.com/uploadfile/file/2021052513364873499.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/t27rpvpk4noik02fpjdf0nv991/98204679490.pdfIn PDF document text
    • http://cherryontop.pl/upload/fotki/file/fisaviv.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/23414fda851ea7b06244a69885e1f0d6/10898691657.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/rexitisogipugifibiwegiw.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/3365945331.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/notaladunexo.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/fgkjic1iegn7j6bvk70tnuqmke/womuparavofedovizuti.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2130ec3d1---rulotori.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/g4qb3qd3t8ocs6pmmcloe4cpe1/pidivaparojitewupuwi.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///52292941148.pdfIn PDF document text
    • https://trotusgrup.ro/ckfinder/userfiles/files/kifanuwarorixobuv.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a63b3578279---fipamujasobokapadapotubik.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/bo45o2dbr240jajib4mnocih43/bewujuf.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074d0c941eeb---82035140087.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/20584714858.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4e0f757a7---vovuzetelofisekavidex.pdfIn PDF document text
    • https://bozoklar.org/ckfinder/userfiles/files/zikadadugexejekoxize.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=risalah+english+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_off0000dfa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B9 18424 bytes
SHA-256: e54aea30560303321626fcee2aab8deba8420e15f387c19905e5e3ac3abb5e81
font_02_sfnt_off0001274a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1274A 10504 bytes
SHA-256: df2b9a95a544338b2e2183ea1adc8dacd019b641bf7174ff4db6659f7ea30e54