Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbf1098fc2dde0bb…

MALICIOUS

PDF

83.4 KB Created: 2021-07-07 20:54:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 24964a68573db4c5befc5704dda140ae SHA-1: 9e8e33706b167940c7b880e306c5effe51793583 SHA-256: fbf1098fc2dde0bbc6fc68890243ec40d23cba31312a3ec6a70acdc0d1d1b35a
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress sites and disposable domains, with several URLs hosting other PDF files. Heuristics indicate a high likelihood of malicious intent, with ClamAV specifically flagging it as 'Pdf.Phishing.Trojan'. The ML classifier also returned a high confidence score for maliciousness. No scripts were extracted, but the structure and URLs strongly suggest a phishing or redirection 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 http://wabasnb.com/files/fckeditor/file/193199290260b8a99c565a1.pdf In PDF document text
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f060503e24---vidokis.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/63572058354.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/g82d8nbecnqasu9d1208md9sm3/dilekuwi.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/57435702409.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160843f6575d9b---4165663636.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/c5c675e9389f5a74a8c689bfcc42ea38/vapasoto.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16075f214b403d---filovakatob.pdfIn PDF document text
    • https://avela.md/userfiles/file/sizuxe.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b54d6e622b7---54831613289.pdfIn PDF document text
    • http://www.zdravotechnika.com/ckfinder/userfiles/files/lawasasu.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a85500bf4ae---sivone.pdfIn PDF document text
    • https://budapestpainter.hu/ckfinder/userfiles/files/12974194806.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdbe2ab11c---16664791194.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/9k6d6j5dcgcqeaqbk2g990uno6/runilun.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/pepupatinuwonek.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/sko38oem6kdnu4o22j5tbt7ro1/wiwobamamisowid.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160889dee16fb5---nuwupiluwamiluzasej.pdfIn PDF document text
    • http://anjilh.com/uploadfile/file///2021050202331073.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/19528121484.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/87915856238.pdfIn PDF document text
    • http://119hero.kr/userData/board/file/vefujelufovebopip.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/9n71u0hdht7gr1eiia94ae7gs2/burudopesaxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=pretty+names+that+start+with+nPDF 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_off0000e2e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E8 10408 bytes
SHA-256: d9e622455137c1c5db9e97ed954dd261451ff1d99ece73646ce10c1029759c05
font_01_sfnt_off0000fa55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11267 17436 bytes
SHA-256: b883ae8874dc0e79311bccd17ae0e17f6d331c6d555565bfa5d34a87fafa6cc7

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