Malicious PDF — malware analysis report

Static analysis result for SHA-256 8edd196e7ffcaac8…

MALICIOUS

PDF

105.0 KB Created: 2021-07-25 12:36:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7039385b5ade9c137d589845f3c47d6c SHA-1: 334231a6115e7c86259e10b19bd47e10d67396a2 SHA-256: 8edd196e7ffcaac84d7222c9a35b3f0285d2ec3567344acd7d20c45eb96eb926
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple compromised CMS upload directories and disposable hosting domains, indicating an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URLs are indicative of a downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://wjcopy.com/upload/files/77542749900.pdf In PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/2e947b4017757197c1ff00af60c413d1/64496379352.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e0b1f8aea6e---49352869982.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077832a329df---9622432353.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc43e15cc1---fojosub.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/28002720214.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/8decafb8413f4b8b5a6392ad2d47efb4/buvusebutigasukisepunur.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/82118025186.pdfIn PDF document text
    • http://hykylalumni.org/userfiles/surexosaxasedusoduwipobu.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf94e7f16c---4036873794.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/5730b8cb29f12ff9e674dc1efb0f945e/bejol.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/34618035677.pdfIn PDF document text
    • https://kleinimmobiliere.lu/userfiles/files/gaxorowutagi.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/mufazakigutujelenujirag.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/navumoxerebu.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/jubotaf.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/kltnttcol45s3c6kfgfk9adpnp/ruluroxutedusizifigo.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/perifuvafotemubilix.pdfIn PDF document text
    • http://language-coach.pl/uploads/files/lidozututisoxip.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/rokopibojudalefuva.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/1993890268.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=libro+matematicas+aplicadas+a+las+ciencias+sociales+1+bachillerato+anayaPDF 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_off000131c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131C2 11044 bytes
SHA-256: 51ebd400e6501076eee7507f705c99bd5deb74fb5c19db71af51d925e1c714e8
font_01_sfnt_off00014b17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B17 19052 bytes
SHA-256: 952295c9c6618e04987f4b925d3d482f4162e675a70cd9fe418fd453a2fc24a7
font_02_sfnt_off00017b63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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