Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aaaa71525d6204d…

MALICIOUS

PDF

81.1 KB Created: 2021-09-17 05:41:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7244e9ca67b7b4f54700d9c357858899 SHA-1: 88683aa752a1bb2625764bbb86878742409d34fc SHA-256: 4aaaa71525d6204d47e424617a34b6e4e233b1c462bab3e5b1a5173c721a4a17
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://irlanc.ru/uplcv?utm_term=cheap+thrills+violin+sheet+music PDF link annotation
    • http://bamila.vn/luutru/files/28032913230.pdfIn PDF document text
    • https://www.area-tlc.com/public/ckfinder/userfiles/files/tidemugokenujapebavi.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/lowopikaxigegurujebafati.pdfIn PDF document text
    • http://medicamarsala.it/userfiles/files/10441413343.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/makekiwufabosevageze.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/d0725e93284f2919954e3496bf4f8bf2/musakewuwatesupe.pdfIn PDF document text
    • http://tacchigroup.com/public/thread/risorse/file/2902111505.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/sivoruwinolutakalivixufen.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/86654242321.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16130abd928db8---84894154529.pdfIn PDF document text
    • http://vinmexindia.com/uploads/1663473655.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/vt2jovjjvkd84s3q8vn0gno1de/5190058033.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16134765c4ddb9---mazukuwisetuwojefi.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/95793928845.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/92284533514.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/31914357607.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/913e5ca24b6be85ed8a59a7a8cd11644/wixexaxibe.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/xixovisoparazak.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613c83cfae047---47760381744.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/201e9e467ac3f5140aae11abc943636f/wudoten.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/fakodozisana.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_off0000d5df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DF 18580 bytes
SHA-256: 55ccb5f53f97e72a47dea2a003a9d7ef8057afae9b2c2d791b05c8e7508f5dfa
font_01_sfnt_off0001062a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062A 10836 bytes
SHA-256: 9932e26fc9a9ff4c88b88f7ea1a62103f95f6eb56ccde79d1297bacc073ad8f0
font_02_sfnt_off00011f0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1