Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d7a4fb50203031a…

MALICIOUS

PDF

80.9 KB Created: 2021-07-09 12:18:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d3e2ac96724b6f6226b94bfeacda2198 SHA-1: ab3b3bb5aa894188c6cbf9afc38ffd6d915435f0 SHA-256: 5d7a4fb50203031aaed25be4fdbda907d0f2a63f92669d071c8492787c0cac71
156 Risk Score

Malware Insights

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

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The file contains numerous embedded URLs pointing to compromised WordPress upload storage and other disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of these links and the PDF's structure strongly suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160967a3bd4868---vesipemi.pdf
    • http://darec.sk/files/files/30644495065.pdf
    • http://theonejsc.com/userfiles/file/narup.pdf
    • http://activesolutionelectric.com/images/file/40723679269.pdf
    • https://gamedunyasi.com/calisma2/files/uploads/24440469646.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/g1a3uee1kifqoic60mgrv740s2/detefoxunogaladoser.pdf
    • http://klefmarken.se/upload/file/62425964498.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/baf0fa432b39cfc0a4d451e0743d780b/xakutivuwekenevenane.pdf
    • https://arvikabc.com/images/uploadedimages/file/85572077919.pdf
    • http://szsahsh.com/uploads/files/54526288820.pdf
    • https://estoniapools.com/contents//files/vamuruvini.pdf
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/m24h234mqfps5tv1r0ugl94qg9/tolawinulatigazupidorej.pdf
    • http://stinpo.com/ckfinder/userfiles/files/nogetupudulebixiragubi.pdf
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160749aa5223df---zitekeneginoru.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160bb5bee512e0---93267092380.pdf
    • https://hkparkkonutlari.com/image/files/nubuxevix.pdf
    • http://kolaykanal.com/userfiles/files/21262279010.pdf
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pesowulisajiwamu.pdf
    • http://canvangdientu.com/images/file/2672361051.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd4a271220---rotefe.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090cfa34408d---62386309839.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160863f3edca4d---sijozolorupejuro.pdf
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/tk1gvdkdqie6au4m9l7c13b95a/vagudijixozumamuxud.pdf
    • https://strategieb2b.com/userfiles/file/sivivefekimosagozar.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b1846ee8f---53353890915.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=availment+of+loan
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da1a.bin
7324cf5222ce81f41eb814901529c0e1fa37ea9e058a622f14f8954195beef2c
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1A 16868 bytes
font_01_sfnt_off00010638.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10638 16792 bytes
font_02_sfnt_off00011e4f.bin
ce331e850bf1259d59f7d59bf8c37aa91b61202f1eae3473388ca0640e648141
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4F 10152 bytes