Malicious PDF — malware analysis report

Static analysis result for SHA-256 43bb66d1dbd87be7…

MALICIOUS

PDF

81.4 KB Created: 2021-08-29 09:43:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 44b5871922df43b3131e0e09ba84fe4f SHA-1: fe52f803dd4bb0ef4c7be2161b269c6f27836b01 SHA-256: 43bb66d1dbd87be7ab71b10c06a4d761168d1e280b804d74a9f7c29582d217a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

The file is a PDF identified as malicious by ML classifiers and ClamAV. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or distribution point for malicious content. The presence of these links and the overall structure indicate an attempt to lure users to external resources, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/mof27mp9ibvgkeoatjart8vhr6/xoviponezag.pdf In PDF document text
    • http://lycee-elm.org/userfiles/file/vasamibobemizojug.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/7da52201b9060233de46ab434884a56a/64670790713.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/b36ccad3dc425ccb73f1e573b95865bb/vulajawaduzal.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0cd0464ea---pirediro.pdfIn PDF document text
    • https://bevelec.com/bevelec/dossierMois/file/55512683697.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/afd393f8455b9ed449fa283980f51ed7/gibugoxulurase.pdfIn PDF document text
    • http://springbook.no/files/rowokezitiresavonekeko.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/miwoxotominixevameti.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16085a3f2406a8---1835622293.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a01c2a6057---vinewatomemozuvojuw.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/xobepozibafubavu.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/34942379968.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f52aafced85---lotusaboninaxetiva.pdfIn PDF document text
    • http://domplus.su/userfiles/files/93428669404.pdfIn PDF document text
    • https://daismene.it/file/45480663019.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/daxakubawukebowelubumoj.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/18617905626.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/d235d5bb5edbbb26742feaf54a8bc7fd/dusujiriduvinepivomi.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/4uudvpq5407rolgq05eb7or4q2/29004212407.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16077d0dea70b5---48646665535.pdfIn PDF document text
    • http://hzqzg.com/d/files/nimiwopeturoxebum.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf3e06f7a9---fokadivegaropub.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/fomeberoderanum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=convert+110+kg+to+poundsPDF 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_off0000d96c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96C 10728 bytes
SHA-256: 20d0953c0e73e9acf6e7786db6931a76a890b3a27cd48c05c02841ef729b6a1e
font_01_sfnt_off0000f21c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2E 17820 bytes
SHA-256: 6a97f29a4e9972a71ffc47724d784be564dffa950087b8832aa0c9829ad508f3