Malicious PDF — malware analysis report

Static analysis result for SHA-256 4295feedba84a688…

MALICIOUS

PDF

78.2 KB Created: 2021-08-10 05:46:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 89fa4f98c0123e718d430482b49ccaaf SHA-1: 54adabd6c4ddd98c121e5bc25d9cdbe7db3603ca SHA-256: 4295feedba84a688071cddb5565f31ec47a304c104f4dbc21374900c0d957d0e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The file's structure and URL patterns align with common techniques for delivering malicious payloads via seemingly innocuous documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://www.stadion-zarya.ru/ckfinder/userfiles/files/safibideloliregofep.pdf In PDF document text
    • https://cuisinescartier.ca/upload/editor/file/taxewapejujidunuwipifog.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/d09loe1elunbdu089r39oeluk7/37991062144.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b57ca951a2---zedugoweje.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077abefe83ea---35392562948.pdfIn PDF document text
    • http://be1971.com/clients/a/a1/a19be2fc4cf8b198b52f296748481ce5/File/venefikilofuradowosivugaj.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/denaripokasoremamikemixud.pdfIn PDF document text
    • https://ebooksweb.net/files/file/pijumujuxi.pdfIn PDF document text
    • http://k2plusinterior.com/userfiles/79342073403.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16103dcf4a23d5---25390685824.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/14873613499.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/dumeradaleworupa.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/rakotunabazufevo.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/balipemitufad.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/2554535944.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/42783399196.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/bc71b65dd8a9e3516288bc0099ba8302/74084140528.pdfIn PDF document text
    • http://sivam.pl/files/file/5314653910.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16097b92c152e3---37356821517.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/98942260658.pdfIn PDF document text
    • http://yilip.net/userData/board/file/wijalupadaloze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=amigos+para+siempre+free+sheet+music+pdfPDF link annotation
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/19823606884.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_off0000cb4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB4D 17716 bytes
SHA-256: 84bd2cad0f5ed4e89d3dd890e1f85a8ea568c7753e0eb663d674b588dc8bdb65
font_01_sfnt_off0000fa04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA04 11000 bytes
SHA-256: 4713e1ad98210dc5fee46581396309f880f800c7419d1a6b69aa322950854122
font_02_sfnt_off0001136c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1136C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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