Malicious PDF — malware analysis report

Static analysis result for SHA-256 a210fd1844f035a6…

MALICIOUS

PDF

97.9 KB Created: 2021-06-26 19:56:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ad7cf98e3d6606a91e1b9086d741d171 SHA-1: 4b084255c6d840f196f56d5cee7f6ecb9708c45d SHA-256: a210fd1844f035a6d0d8c99ee2bb9a423b2dd3c7760eacbae42ffc4a5293fa61
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, preventing a deeper analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

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://getem.plfiles/file/8018227533.pdf In PDF document text
    • https://nnkcreations.com/userfiles/file/kiwonu.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/vowojaduxiruburesokokuli.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/00c073d7973426f0975a3abd46a63e95/2730872067.pdfIn PDF document text
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/abc4a47787d39b4527f21ab5c96dc3ae/zejajunelokazeg.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/fkr9f199eu9oo7783v23erlpp0/42037674801.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/b63d832747005fc9e8f479817a57f60c/94811787246.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c7953908dd9---jiwababutofob.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/dnkb0r4907go9tcsou9mmsfmsl/51902404803.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/hkie05f2jk4fhm81fjuaukpc51/87807632001.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079282f27829---6811792907.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210524175008.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160cb8c6f650e6---mavegodapokematusexe.pdfIn PDF document text
    • http://americanewbie.com/userfiles/file/95575977584.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/8v6t65cli0lelrdk5ejvhqejg6/92676903431.pdfIn PDF document text
    • http://pamat.ro/UserFiles/file/firogur.pdfIn PDF document text
    • http://burstallconrad.com/editor_files/file/wadukif.pdfIn PDF document text
    • https://giustofiori.it/file/wofudelabesijo.pdfIn PDF document text
    • http://dancedynamicsla.com/clients/38740/File/88848115955.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160adbf3e53ada---ragosokagadokin.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b839d466ec8---41441674808.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/27537517983.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/ip67jin7iromjab8jl968835g1/gujepezigeduvabol.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/kudegagad.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/7476703a5362927d512615d058f938bd/fufisijosoxuf.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop//contents/96619831438.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=period+while+on+the+pillPDF 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_off000115a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A8 10248 bytes
SHA-256: 38b4e1bb8dd68ca83e422de56f37d2f6dcf5deef27a9193e60b07e806ba890d3
font_01_sfnt_off00012c94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C94 20504 bytes
SHA-256: 3b284352c3b4fbc657b574150944269d97212832ff3b1d2982307128c6ec2130
font_02_sfnt_off00016089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16089 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1