Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0571f360f82d3aa…

MALICIOUS

PDF

69.0 KB Created: 2021-09-07 19:56:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 194c0f766d263e75dcf3b80eae36fb32 SHA-1: 6925eb60ea7f6dcd31fb5a38a704d6912020e2ab SHA-256: b0571f360f82d3aa921ffade3090faef42dcde66821c56fcaa8608c28941b5cf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a link farm pointing to multiple domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to download further malicious content or visit phishing sites. No scripts were extracted, but the structure and URL patterns are indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://nnt52.ru/userfiles/file/fesarofulaboroxadavuxap.pdf In PDF document text
    • http://tagsu.com/attachments/fckattachments/file/vokujijaridaramon.pdfIn PDF document text
    • http://doorsatyrau.com/ckfinder/userfiles/files/17492259128.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1611c0e638eb43---25565288176.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1627849625.pdfIn PDF document text
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/6213962822.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/panugubexul.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a34f4750d3---rejunima.pdfIn PDF document text
    • https://tl-systems.hu/files/files/81278244858.pdfIn PDF document text
    • http://gumberryoleschool.com/clients/33891/File/vonuseratarusoj.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b153fef2970---zapifelugidijakubazusora.pdfIn PDF document text
    • http://gloria-eurex.com/images/blog//file/596456359.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160babd18d85e0---xokomisupezezojetifil.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/8pvfj8k4infbk435ij9oh8df09/zuzafinozoxalipefebemod.pdfIn PDF document text
    • http://dralituncer.com/userfiles/file/33841255465.pdfIn PDF document text
    • https://hijaustabilo.com/contents/files/damotamesarapupebijumam.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/37882393467.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc669e71d44---27932862109.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles//files/71525830660.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af17ecf394c---76326884828.pdfIn PDF document text
    • https://lecachet.fr/docs/files/38889379366.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160987cb7be7f3---vitudezekuwumufib.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/xababalemaku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=verb+list+present+past+past+participle+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_off0000b247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB247 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA59 14560 bytes
SHA-256: 7d95611861be420098600ca800cfd47bc5ac0b602b0ba026559e9647ac36e22b
font_02_sfnt_off0000ee6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6B 10604 bytes
SHA-256: dfd0fdb33d4a4a82e8e0c2e74e1ff89f31fdc24defa8d2ba4e7e1915d8986609

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