Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bcaba166eef9c61…

MALICIOUS

PDF

69.6 KB Created: 2021-09-26 21:07:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 35f6590c06805bea1087cd6eabe755e9 SHA-1: 181cf204fb279c69193a09a0dba2f6164232a03d SHA-256: 8bcaba166eef9c614c73bbaca06265575637d3055f019a3171d92a786fe8797c
176 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The presence of ClamAV detection and ML classification as malicious, along with heuristics for compromised CMS uploads and callback lures, strongly suggests a phishing or malware distribution attempt. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/22632226610.pdf In PDF document text
    • http://synhbio.com/upload/files/60787525905.pdfIn PDF document text
    • http://gemwishrs.com/ckfinder/stones/files/mepebaroru.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/b81b6a9798c7675091971bfc2c5deba0/44247244188.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/t7mjcb7767sv1m57gkeuvhtbng/saxuxodutudusaxosozopi.pdfIn PDF document text
    • https://nsaimmigration.com/userfiles/file/bogugivaxijafutixiwubuzi.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/taxuxezoxegupavu.pdfIn PDF document text
    • http://torgoborud.org/images/file/68232388661.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/91455911174.pdfIn PDF document text
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/43452806486.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/tekizazusawuzasokakag.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/pipunuxoninaviruxixowojev.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/mixazomixupukawisudola.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/33664751634.pdfIn PDF document text
    • http://abpaluso.com/upload/file/84352661737.pdfIn PDF document text
    • http://dreamwith.gni.kr/ckupload/files/80923643671.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/12123238988.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/652f4f40de9c18aa17182370fbb85789/2511169949.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/bunukejefune.pdfIn PDF document text
    • http://swissies.lt/ckfinder/userfiles/files/26802676760.pdfIn PDF document text
    • http://getwealthythisyear.com/ckfinder/userfiles/files/27391656999.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/vumevobute.pdfIn PDF document text
    • https://cooperadora.grupocreartel.com/documentos/archivos/79687999986.pdfIn PDF document text
    • http://laskod.hu/userfiles/file/jelilovu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=mobomarket+for+pcPDF 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_off0000aff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC807 10456 bytes
SHA-256: 74516a3028c9126794f682edd9f638859c45437d2ef115347aa3e4554ebcc9c8
font_02_sfnt_off0000df9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9C 16424 bytes
SHA-256: 322a17740bcfa079c5dd8e475a9edd08218912255ceefa426b6c0582ecd6d427

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