Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0eb3443e34af711…

MALICIOUS

PDF

79.0 KB Created: 2021-09-06 11:53:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2789e07ea3087a8d857d399f097c3bac SHA-1: b072c759253f2df12f0c376322424c8358deca4e SHA-256: d0eb3443e34af7110431ee5461516ba70aa8525fcfee8088a0676f59f61e5455
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to PDF files hosted on compromised websites, suggesting a link farm used for SEO poisoning or to lure users to malicious content. The presence of multiple compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/515c420bbaa8e8d41d1ecf347dd15c53/31030568364.pdf In PDF document text
    • http://summitremodelinginc.com/userfiles/files/jatikatox.pdfIn PDF document text
    • http://geose.ru/userfiles/file/mikonetegowizakuturovu.pdfIn PDF document text
    • http://vagyonvedelemszolnok.hu/admin/fck_upload/file/85892200027.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/02beb21a1a22f6355b5e88d617efc7ec/xamavebewifelujas.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/vawopar.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/masomafavebap.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aceb9b8485c---68711024469.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/36383e9fbfb1efe8e7dcb903e7ce552a/nugesum.pdfIn PDF document text
    • http://alkanboya.com/files/file///85395978771.pdfIn PDF document text
    • https://vitanov.rs//files/99210841687.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/gadikerafe.pdfIn PDF document text
    • http://pass38.com/images/contentimages/files/fibalomiwi.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/fqsdnhleclnt954m98efg0g8nc/21717518575.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/3e2fcc6a608f3a2f2de3b56e2c00a947/nopobojeluva.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/o34i4nm7vf8hsc82buqk4julo9/pawebixaxamaw.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/83794743888.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e1ebe78b0---99001502480.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1c9f6044b---bazixuravopenili.pdfIn PDF document text
    • https://msvadba.ru/files/file/75952525604.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/soxitomegadufuwo.pdfIn PDF document text
    • http://parkhighclassof60.com/clients/871169/File/moniluwibebudurivapezomi.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ad8f14c82---jasaxo.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/80094328306.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/bisekobupetogasabin.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/23775919664.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=aqa+gcse+english+revision+guide+pdfPDF 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_off0000ccd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E8 11096 bytes
SHA-256: f354cfb50a44da1ff2eba4ac1c4c39f610d75bc409489dc43686abad2a3dfbcf
font_02_sfnt_off0000fe29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE29 18436 bytes
SHA-256: ff244c2987b1b1658e2f2b7e35af49163fad00a9c6b7e38c027c5c1a260e03ec