Malicious PDF — malware analysis report

Static analysis result for SHA-256 607f367b266d7439…

MALICIOUS

PDF

80.3 KB Created: 2021-08-26 11:27:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 87b4797165170d493b18adbcc3f8cc70 SHA-1: 5357477395ef7c4fbb64c97e904069df0f8a5d7c SHA-256: 607f367b266d74392ab004ebc97bfe1cc5e216661bc2fad0da10f4a6b348aab2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was identified as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or redirection attempt. While no scripts were directly extracted, the nature of the link farm and the PDF structure indicate an attempt to lure users to external resources, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://atraba-holding.com/userfiles/file/zopamezeboxitujirubeged.pdf In PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160753e5154887---43757605375.pdfIn PDF document text
    • https://seitonsolutions.com/ci/files/gimiroxipok.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/49536807500.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/3a26fbc091efe314a2464cbc1991b450/wumoved.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16092edcebdb6e---86930576401.pdfIn PDF document text
    • https://motty-etai-sharon.com/files/files/42620350112.pdfIn PDF document text
    • http://a-xian-coat.com/uploads/files/202108190534032903.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/0ekv8vllt9ibvs8orvoj8ibus2/42630530250.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/2543356974.pdfIn PDF document text
    • https://bdsvieclam.com/upload/files/55161704142.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/b0a88d2bipib49jdkl66bvvr87/gedoripatuvijupiwigovob.pdfIn PDF document text
    • https://edbcagliari.it/file/gororuzuzasuwirefuve.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/65318581316.pdfIn PDF document text
    • https://humicdp.com/uploads/2021-08-10/images/files/70630501398.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/33a4d5761bf6932ead411c12c38e1365/reganusozipibikegur.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/90651500478.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/u15d62htejdvrftr99quii7sl7/62878700812.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/kizim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=cooking+mince+pies+from+frozenPDF 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_off0000d764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD764 16780 bytes
SHA-256: 2bbbd5b549e7cc5051f55a59219d4684eb933c103c45b76b9f818fafc1331e0d
font_01_sfnt_off00010313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10313 10700 bytes
SHA-256: 93d2d94050a43fa4da42cf813049a5188ea46478b3d655f09ece9953287a884c
font_02_sfnt_off00011ba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1