Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6f22877107d40bd…

MALICIOUS

PDF

88.3 KB Created: 2021-09-07 01:04:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6eed09a215d36a395f52c099634e72c7 SHA-1: 090c30d72c6bad0921967af6bef8492a5009b4f1 SHA-256: b6f22877107d40bdcd8d2cfb2a40b5b2c6dec6657e10e3f07bab2a00c695cfa6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous links to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://synerhu.ru/uplcv?utm_term=teori+akuntansi+suwardjono+bab+5+konsep+dasar+pdf PDF link annotation
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/4eaa545a57f3531cd1059190fce565d2/70508707234.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/6469108300.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/61815932982.pdfIn PDF document text
    • https://semangkabiji.com/contents/files/16861107998.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c3006c3a227---96753723714.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/83520497837.pdfIn PDF document text
    • http://www.pavimentosyreformasferlu.es/ckfinder/userfiles/files/43318976895.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/84435676489.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c28844682b1---lalonojegudaru.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/zodepize.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc29a5db1d---kogakere.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/11f6cde02683738b1168233a0452d5ef/weradevixopewezabub.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/75758290435.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e0bb12ebb---bokowe.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/8052adafbaa4ac2d441b412891fb1950/zubofonoxafotixosatir.pdfIn PDF document text
    • http://bixenony.com/userfiles/files/28044475892.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/b49145b3a91fa855c7d9547b7fe80a44/fomonaxusuxoxipifotaja.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c042529e03---36612748990.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ddb0fbe7213---bijegufiluresurep.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/76044709734.pdfIn PDF document text
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/25954601804.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/8bc2356f8676d4cc3754dd6bc25ef7ff/gupuzajijab.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/08fb15ad4d7f255ede488d5283b2ec68/zubegugepimurowodu.pdfIn PDF document text
    • http://ff-engineering.com/userfiles/files/rorud.pdfIn PDF document text
    • http://amandamaitland.com/images/file/wekafefiponina.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c9b95d0a8---33027107354.pdfIn PDF document text
    • 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_off0000f684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF684 11092 bytes
SHA-256: dfde046c2e58601d8c71191e6e502798a6998d677a548d44242536e8350a55ed
font_01_sfnt_off0001105c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1105C 16360 bytes
SHA-256: 2f4ed95f52fc68e9a44fc3f9217aafeb56a3c21c09960626c9f889e4dc693190
font_02_sfnt_off00013ae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1