Malicious PDF — malware analysis report

Static analysis result for SHA-256 f619cea517c114a1…

MALICIOUS

PDF

76.1 KB Created: 2021-09-30 13:56:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 537d2716bc33f7d4aabb6282737a1d7b SHA-1: 87529d41c8459910e099c6b84cc2a40d8c6c5c7a SHA-256: f619cea517c114a19094039ccc1ac5931ef490ccae1eaade82aae28bcef9a202
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the nature of the link farm and the PDF structure itself are indicative of malicious redirection techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://queure.ru/uplcv?utm_term=samsung+sm+j500f+flash+file PDF link annotation
    • http://kiko168.com/UploadFile/file/20210908224820321.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/42667480529.pdfIn PDF document text
    • http://zamaro.cz/images/fcke_files/file/19256237068.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/koh1oqmuaf8hqnaf110jaca45q/18310070406.pdfIn PDF document text
    • http://spbmedaks.ru/sites/default/files/uploads/41347467428.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/62458094670.pdfIn PDF document text
    • http://marienoellebermond.com/img/uploaded/file/penumiliparejepepigimede.pdfIn PDF document text
    • http://shop-cartuning.pl/userfiles/file/wujenilomarow.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/20896902647.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/wizavivizokukaje.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/37237590761.pdfIn PDF document text
    • http://cdkuys.handysociality.com/upload/files/62909152098.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3a7870747---22166448833.pdfIn PDF document text
    • https://rtquery.reitoken.org/Coaching123/images/files/jolijepogop.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/40023751910.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/15673068558.pdfIn PDF document text
    • https://webrekruit.com/php_codes/Scott/VieauAssociates/code/userfiles/file/81437585982.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/8tglkk1u7ncaup4htc8ggtu50t/44658786887.pdfIn PDF document text
    • http://ciaomamma.hu/editor_up/zakipujebokivelopewipewi.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/viwafejavujowipibuxovu.pdfIn PDF document text
    • http://emannsltd.com/userfiles/37335899506.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/porutebuvafiwutunijunaja.pdfIn PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/55165217621.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd5359fd07---12107376277.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_off0000bbce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBCE 10904 bytes
SHA-256: 009958fa24ef2b0d67dc0d8e60a21d963da1c95a546ce60d836ba5f1a4b7f9d6
font_01_sfnt_off0000d4d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ece6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE6 20848 bytes
SHA-256: f58a7fc98c29b9c0784107d782b1da404b4eaf404d6f2fba74244da640809b67