Malicious PDF — malware analysis report

Static analysis result for SHA-256 7955d5161e1f990f…

MALICIOUS

PDF

84.9 KB Created: 2021-10-10 03:30:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ad116e0bf1051796df99c514bcc177f4 SHA-1: 2f79c3205bea2666605db7d053c17cd078c09299 SHA-256: 7955d5161e1f990fafcc38e7e344a97e3333bff8ecf3f6d17b5486beb89d22f5
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to other PDF files hosted on various domains, indicating a link farm. Several heuristics suggest these links are part of a compromised CMS upload or a disposable hosting setup, likely for SEO manipulation or to distribute further malicious content. ClamAV detected this file as a phishing trojan, and the ML classifier also flagged it as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://moveo-sport.pl/userfiles/file/nofegedupuken.pdf In PDF document text
    • https://noticky.net/akce/fotky/file/vodagunagodisap.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/bokufotefa.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16146e30baff3a---kewitapifagewak.pdfIn PDF document text
    • http://sinners-party.de/media/file/61998935159.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/13093727166.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1614b05661c2bd---99572545271.pdfIn PDF document text
    • http://abpjse.news-read.com/upload/files/waruzeruxat.pdfIn PDF document text
    • https://karthikaspices.com/uploads/file/40572162406.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/2ecfb464750b5e4f2ab10330d284ad9b/93218192882.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/97063859401.pdfIn PDF document text
    • http://stilistspb.online/public/files/uploads/files/2426001569.pdfIn PDF document text
    • http://wedding-box100.com/uploads/files/202110062345598033.pdfIn PDF document text
    • https://svezadjecu.me/userfiles/file/wuluwakuveponesiw.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba207a607c---zumitukafusixadewuz.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/korupozuxupimanujugev.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/muguxikaguxadog.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/99d4aa30728cc44ef868ccc484a07888/bimutikezu.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/e0a403eecb2947b28ff6990e73b80461/46852294769.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/sipm9f0c6ej8apqj2tnq1pn4bb/35156935163.pdfIn PDF document text
    • http://szybkieprawko.pl/szybkieprawko.pl/user/admin/fck/file/werepej.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/tenijinedokezi.pdfIn PDF document text
    • https://ooobelkom.ru/ckfinder/userfiles/files/sobugumewefevajaz.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/kulogato.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=dolly+parton+without+her+wig+onPDF 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_off0000e038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE038 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f84a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84A 20556 bytes
SHA-256: 8d18e033dff45ce1e662b41ae9ed861af58e5c4e148cad8dbcadc007bb01f466
font_02_sfnt_off00012dd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD2 10664 bytes
SHA-256: 8057f718f22de31fde28b112baa811e52fbf89aabfa075cb5fec38905dd88d06