Malicious PDF — malware analysis report

Static analysis result for SHA-256 756647d7f55ad1fd…

MALICIOUS

PDF

92.2 KB Created: 2021-09-01 01:29:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8cd302c1cef4ea2cf49e89a526960d75 SHA-1: a6508b6a60bf87795d7ab61e6497d65191704180 SHA-256: 756647d7f55ad1fd75fc1193a5ae0d142c775eaed40ca3bfc8622564d302f5ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV detecting it as a phishing trojan. The file contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://medvor.ru/uplcv?utm_term=bane+of+the+sith PDF link annotation
    • http://accronline.com/userfiles/file/pilixajemimudezedamamo.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/b4la9c8q97i336qf1cdbndsec2/71568237160.pdfIn PDF document text
    • http://studiotecnicofrisoli.com/userfiles/files/kifiv.pdfIn PDF document text
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/viluwiv.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/hrpaj6s04995v3i8iqa6vovaq2/75002452730.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/labemixaf.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/50bhdcjut9qgt9kq66nko3vmq1/nopemitomige.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e10c67b578---saxafaxumevezexi.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/gikinoletedix.pdfIn PDF document text
    • http://393citizen.com/upload/files/jofitugenepatafiburip.pdfIn PDF document text
    • https://windsbs.biz/files/file/48290744940.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a53d12dda---lepifuvafugirofigikumoru.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/torokozidu.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bf155248bc9---77587527088.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1611b860b9e4ae---16389673803.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/sawifekabekivaluxomuzu.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160a194ab03f10---4821164149.pdfIn PDF document text
    • http://sergey-yushkov.com/pict/file/kuxuvavomotakibosav.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fca098f308---sawomabiwovoxagus.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b8dc5d312---goxupebepaza.pdfIn PDF document text
    • https://primer-spb.ru/files/files/xezarumozamolikeliruzavir.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/66907201384.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/cbe1bb2omnvqmear893tvj76ih/zekenimebepixeduzupib.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877712a7f02---ragixaxiwekibu.pdfIn PDF document text
    • https://smilepaper.tw/archive/upload/files/xivegaboseb.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b04de43c4---38535367967.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_off00010550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10550 10220 bytes
SHA-256: 2b80e64936df271e62a0138a99a2286eaaee2e98034e6c95fe3450f18dc0cd85
font_01_sfnt_off00011c3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001344d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1344D 17984 bytes
SHA-256: e3e2e2493fcd46eeae91abd73be2ac290a773c0433338c5a47d9ae7e5948f427

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