Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b37304874cdc879…

MALICIOUS

PDF

75.2 KB Created: 2021-05-27 21:42:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25aaf600994cda24d76a27537917e41c SHA-1: 9a401c59cbff9e4ffd19f374e9b9769106c5b909 SHA-256: 3b37304874cdc8791511eccd438df5e0aca22610e6d6374e00f201d8b5338171
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and embedded URLs point towards an attempt to exploit user curiosity via the 'how to fake a facetime screenshot' lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/8e36b21a4f1bc34d85f0211ab8d23d22/ledivutavovu.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f54260d5ad---kedofugivan.pdf
    • https://mfdesign.hu/files/file/kowabuxoker.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/45ed3dfc16dc04af1609d01cdc6b2e00/21323320580.pdf
    • http://debden.org/userfiles/file/33017039819.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/163gs3rdo9kn4qbtgvetrmflpe/wakubijuwuwozutagak.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/h2qt8r9t1bd180om99j6jj3tm0/63067578621.pdf
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d5fc77121---tosepironidodubovup.pdf
    • https://dialogueinpraxis.net/files/docs/tusipa.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7edbed4ea---gudisedafurilu.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608874d34a9be---busanuzebadifuragikafe.pdf
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093abfadde50---xeraberimap.pdf
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160849975675cc---fixiwezexirerufa.pdf
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607849bf6dca9---10124953830.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607c987c2ec1b---7883352253.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb717be46f---12899295004.pdf
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/0dsu0j6ulgmh5f30le268qgn71/biwupu.pdf
    • http://www.pattyn360.com/upload/forum/files/wirobowawogesokepigepafow.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+fake+a+facetime+screenshot
    • 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://scripts.sil.org/OFL
    • 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_off0000d3f7.bin
411b36bc7dcd4d84fbb111aab1c8d24696d18390499a69977b331681790255bb
pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F7 5204 bytes
font_01_sfnt_off0000e598.bin
92ddb4c01e0d4cd815d50bdaa4f758049aeae65635cfda82d73b9cb8168a1788
pdf-font-stream PDF embedded font (sfnt) at offset 0xE598 10376 bytes
font_02_sfnt_off00010930.bin
c64f975c7c74378765a15e192890ba001b575443647995d4109c17b56814fb1e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10930 16544 bytes