Malicious PDF — malware analysis report

Static analysis result for SHA-256 de70b826196fcb87…

MALICIOUS

PDF

90.9 KB Created: 2021-08-05 06:35:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d1163053a5d804069441d3907260f4e1 SHA-1: ae465a983a409e726caf810364555075611606f6 SHA-256: de70b826196fcb8718292349276f73227e944a4da2c67f1961e7b77036f46b41
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to other PDF files hosted on various websites, suggesting a multi-stage distribution or phishing campaign. The presence of multiple compromised CMS upload links further indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://cuahuyhoang.com/media/ftp/file/fifakixegakuwikuruwo.pdf In PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/7ten8ohbs63v25pmf0k75vcr25/buboxi.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071efa0b09a6---kikuxugagelezotibeziruki.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/sosikaparekizifafedewa.pdfIn PDF document text
    • http://clubchic.lv/c/i/files/94005623793.pdfIn PDF document text
    • http://seigyobannkaigaikikaku.com/ckfinder/userfiles/files/22051125696.pdfIn PDF document text
    • http://maybomnuocdanang.com/uploads/image/files/85215476193.pdfIn PDF document text
    • http://gamebonda.com/ckupload/files/88161250157.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/lizamilija.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/8f0677adcdea08e1032392f3539afdb7/namadesirafuse.pdfIn PDF document text
    • http://mrukseo.pl/userfiles/file/mutegesuwumasavuvedulive.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/firobinefoseraz.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/xeloparepakinivifuf.pdfIn PDF document text
    • https://area5srl.it/file/bupuwunutatuvarizoneg.pdfIn PDF document text
    • http://china-miyaco.com/img/file/202161245938.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0d8bc81c2---43179455107.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e9cde4598---49472809904.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/b9303b9aa72eebc78e89f011f9b02f82/88746883161.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba57e7e896---bazakofux.pdfIn PDF document text
    • http://xiaohecollege.com/d/files/58895445926.pdfIn PDF document text
    • https://codecs.roimages/file/jexadadidajodano.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/up1du497tgo0dl6fkerism0uf0/wosupiguxovirixozusav.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/9d8bbcdad94a1cafd515ade78c96501e/vupakolusaluxat.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/dipapa.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/40592723783.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c869bc99460---susenewenosidirifanekojo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=smok+stick+prince+owners+manualPDF 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_off0000fe2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2D 16852 bytes
SHA-256: 680bd9a3c6e5f770e03a8fcfdaad8829b386e3db5ea1d31d84e88a7f2ca448f9
font_01_sfnt_off00012a36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A36 10888 bytes
SHA-256: 21bd7176b49908ab5398e0027cc5470e0a76469947beb6fa6910229d88137573
font_02_sfnt_off00014376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14376 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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