Malicious PDF — malware analysis report

Static analysis result for SHA-256 7241f354eeda8f78…

MALICIOUS

PDF

81.7 KB Created: 2021-09-13 01:32:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a85d6d094ba504237614980c60ce306d SHA-1: c6228e41c7ffbb2c48b6b30ef399029ff9047176 SHA-256: 7241f354eeda8f78d635f5b267fdb7d86802aa21e483e439a4496a99829b84fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://olterus.org/contents/files/18219799790.pdf In PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/koxapejuje.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/57554968328.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/20708848006.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/42632278834.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/59462924986.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d6c8219c1---mikubelubivosisupov.pdfIn PDF document text
    • http://cx-gl.hu/images/files/lijavavebewazefefijoju.pdfIn PDF document text
    • https://adurucui.com/ckfinder/files/3898393621.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/lujifunifopisesedos.pdfIn PDF document text
    • http://snsi.jp/image/news_file/36411363697.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/42692995839.pdfIn PDF document text
    • https://testgit.begurholidays.com/uploads/userfiles/files/xalafaziwusugizifejigor.pdfIn PDF document text
    • http://mtsp.by/userfiles/files/88472192017.pdfIn PDF document text
    • https://fallahi-sch.com/userfiles/file/namewopawezovorusokirij.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/76072279320.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/9fbb70091419444e1e956eea1c47e2da/povasu.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/gusorulezinurawez.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/dewopomurenijenumijarizub.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/31009488667.pdfIn PDF document text
    • http://frickcontrols.com/uploads/files/bimegaxedelubirudubap.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/41221283849.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/rnno61ismnf8iatnn17qb7krch/xokoxevanudinitalorowojer.pdfIn PDF document text
    • https://grnca.org/img/files/files/45615414645.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+reset+home+screen+androidPDF 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_off0000d6b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B2 19600 bytes
SHA-256: e9b1a95f8a20a14c4d0796436c65739e86dc52cf69ce4414d930a8ec7ed5783b
font_01_sfnt_off000108c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C8 10668 bytes
SHA-256: 090beb8e4ac781819d8b3083e25106c36adacf9f993ecb262c32bebfff20841a
font_02_sfnt_off0001211a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1211A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1