Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b7e4698b887e097…

MALICIOUS

PDF

92.8 KB Created: 2021-06-27 09:44:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: b9b69b34dae869d1bbcaecf5138c2fe6 SHA-1: 42cd55de4e02f3c8103b25ec12baaa66757a95b0 SHA-256: 4b7e4698b887e0978eeedac079345bd4051f189e4ccd37e717f90d91927c29ac
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting it's designed to distribute further malicious content. The presence of a visual download button lure reinforces the phishing or malware distribution pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9fa698a75e---domuxepoxirur.pdf In PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/kn3qgt5bjotvkmu3rfdk99du65/29660456627.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/e03ade5d562339293d944cb20b5619c3/vobatutagozurujijuzu.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ceb33d6607c---45074744049.pdfIn PDF document text
    • http://citra.cl/userfiles/file/revobezaj.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/jorometevo.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4796e776c---43065103977.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/ab03cb163904b12e8837f05d8524d356/74603055444.pdfIn PDF document text
    • http://msiutilities.biz/documents/janexepogi.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4072e1b33---tikomewusukowivufoni.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/908cf42b83c289caeacf4b500736f6b9/62798913567.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/1d3c6689942f615ff388591fb52f4474/guriwegodumo.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d340621f172---pojenafo.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609893fedb7a1---peboxigofed.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/tarerogutogumuzimiv.pdfIn PDF document text
    • http://laweasy.kr/userfiles/file/88578619175.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe2c986694---43654986628.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/61479910988.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/sosidujelabulil.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cb8985a0aa5---12236776335.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/51441948035.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/kapodalulonosuvu.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/n1lt6upcebpekjm4mt7i9qiui7/zigakoxiruze.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/14189731161.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=hs+2nd+year+economics+question+answerPDF 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_off0001085f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085F 16892 bytes
SHA-256: 4ce4e34bf6486ebc7bb3926852d509ba4b11266e13267f98afe76c0090ce9d45
font_01_sfnt_off00013431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13431 11040 bytes
SHA-256: 01d60e2eb691f570d8ab84031ba55f15e0d0deddd2e69ac6bd391d5f8f5ce236
font_02_sfnt_off00014dce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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