Malicious PDF — malware analysis report

Static analysis result for SHA-256 504b83886ca99c19…

MALICIOUS

PDF

87.9 KB Created: 2021-07-18 00:22:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0a080c025accb48d5987b4aef27ea53a SHA-1: 341491611934745d2feaa39bc7f5b5da5a402b2e SHA-256: 504b83886ca99c191a88ccfbbd9c029e2d60b883c9d370fd8181876b75ac5bc9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains a link farm with multiple URLs pointing to compromised CMS upload storage, suggesting an attempt to lure users to malicious content. The presence of embedded URLs and the nature of the link farm indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/49afeb821ad9a76ac842fe6e9caf67c1/josojaji.pdf In PDF document text
    • http://topcudental.com/img/userfiles/files/24079553681.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/bifoxalome.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5949630f7---697072025.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/k41el0t1b2mpjbs2igr9s5aquo/54986930514.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/susixuwaz.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607192cc1f3c2---82047697039.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f00a39cd4b2---pibazujavesipi.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098743157f42---xenevetefejijapape.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d4b42c0ee---72572169547.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/7078816627.pdfIn PDF document text
    • https://olterus.com/contents//files/joratatun.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/47323380174.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/wekuw.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c45554a6d73---2482708684.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/tijezirulisa.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/83455a02104e4e600084089d3bc4b4e3/vifexezexuvelu.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/pewafinevovutazeji.pdfIn PDF document text
    • https://arzhosting.com/calisma2/files/uploads/72358832544.pdfIn PDF document text
    • http://jamesirvinewedding.com/clients/f/f9/f947a18657f5d77a8fcd192ffd4ccf25/File/60374574572.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/t2sf9shp04hvlfee9tamm94oef/65322827418.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021062102342280554.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/famegararifepejarogofimom.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/xogunonukoxuxam.pdfIn PDF document text
    • https://kede.org/userfiles/file/tamoxazodubijena.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/t0gj29sa976b3al02i4b260pt3/tuzuzus.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/kapomorugunuluserirux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=live+wallpapers+for+phonesPDF 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_off0000f270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF270 17544 bytes
SHA-256: afd1eb502bc1247cc9fb04fc871bf928b5359feec7a81e60e9ac7c4934d32a4a
font_01_sfnt_off000120aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000138c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138C1 10468 bytes
SHA-256: 2ea6ce708a57ad6d2b025bc41924ee293fca5058432055b65495f7d42e25082f