Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cae9b4e87fb0064…

MALICIOUS

PDF

99.3 KB Created: 2021-09-06 04:02:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b8997160792e97d0c483523aba92082b SHA-1: f5212010c239a841abf222346797de63169ffc53 SHA-256: 2cae9b4e87fb006442a0d2eac2efdebfef7307d867d4d66304e386a9e534655d
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 websites, many of which appear to be compromised CMS uploads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure suggests the document's primary purpose is to redirect users to external, potentially malicious, URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/3b278dff4e8fdd809609ae4bf0285287/29793835616.pdf In PDF document text
    • https://shiphangnhanh.net/uploads/image/files/wixuzojesevirerafa.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/30259450622.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f17b16064b---sefebu.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/bekesofoxazikatup.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/sesobodagaxuletaxew.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/70529031827.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/qb0d6jvrogfa571v28kvppmb8i/16008400066.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/48539622399.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210710_2E491660F75DBC2E.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/46434d92e060f9637d2538265b35cae8/95387002618.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/buzujalusafo.pdfIn PDF document text
    • http://professional-tuner.at/uploaded/file/radinigiw.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/rixisonelapox.pdfIn PDF document text
    • https://crcnueva.naturasoftware.com/uploads/images/files/74971020092.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160a242bd75b2c---labukimukowotoridamepeto.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/98745302029.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/d8df6b0014a33313186675331de3dfde/87298581948.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/91724f4945c3255247dbb327e0406542/rajivonawirudosa.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/3b875hoom8d9spjk0ig2eiomu3/zanimeje.pdfIn PDF document text
    • http://bscartridge.com/pic/joxakupibosadudelas.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/mizotobilokuz.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/6lnufe98g2uuhm4ni3md9hn18a/91720753419.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/30491662723.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=gestalt+learning+theory+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_off00011c27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001343e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1343E 10932 bytes
SHA-256: 8956d348c80cfd7f7b5f311293a5078cfa6180d319acc173b2d7f0b2c8d61a9c
font_02_sfnt_off00014d56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D56 19568 bytes
SHA-256: 3079f990eb4770ec9839631a4644b80eb8261d17d0451b7cfc554f238c928d44

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