Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8ee1e27cc810860…

MALICIOUS

PDF

94.7 KB Created: 2021-06-29 06:53:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 93747dde823c860e9c1661e87d4d680c SHA-1: 97ae4ace58badb6366449eebcfc820f0e26d456e SHA-256: a8ee1e27cc8108607d3b4e3247942310e91606326c936e36c60c17be9b731a3b
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of numerous unknown URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

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://mientrungpetrohotel.com/users/files/tipow.pdf In PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/860cba1cbefffd613c75dd91496b229e/97275299905.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7cea0f77f8b59347afda610e3778a15c/wubazelipaparujudefumu.pdfIn PDF document text
    • http://beautyyaurient.com/editor_upload/file/65684011352.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/xizewoxatuzerure.pdfIn PDF document text
    • http://cocoal.com/uploads/file/funesiduxiwelisasave.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/8bb402dc87e16143b61749a2fc5eefd8/salabomunigefezuvetujex.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160abc103dd20a---46385768048.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/gufavofubanulogonosi.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/riwubinemo.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/gasepiget.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/d5676df94220880977ce88bb0b571ed7/34777617825.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608a542e15b71---jurupopupapaf.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/706171930.pdfIn PDF document text
    • http://charivne.info/images/file/vamiwemuxutevu.pdfIn PDF document text
    • https://soechi.id/userfiles/file/woxisabo.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b49e5b29d47---lutijetenevijunamanum.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/2477534101.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/v9ljvdqj2frlt9ee5hp5o6bpro/12043253476.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/11117173024.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/ecc5abb24f8aca0245b664f23ac7351f/12044519459.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/d9f4df5067cf9df07bbbb43c34a20b1e/nujezowa.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/jopegijofajezejekofuni.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/d0dm3agg6ku56vve9g62nd02kt/32961074796.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/55b42c03f288bcf847ecd5e7d598ebdc/30568726496.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/4847653a73b4d157c45a96199acc8bba/wikowu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=complete+jewish+bible+download+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF560 17156 bytes
SHA-256: c2104a614203501aa5178d8c9b608cec630f9023c19ce38531f023244a39f372
font_01_sfnt_off00010eb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126CD 11048 bytes
SHA-256: 86b19a3c70632534ed4f46b64bceb9b26754fb7b14f0e7141e1af11bc061f1a4
font_03_sfnt_off0001401c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1401C 17140 bytes
SHA-256: abeca831ff5b2b2217150b264572c00e51fdc6db5ac04a6074cd2128a2228b70