Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6cf5991e9b0fb80…

MALICIOUS

PDF

91.2 KB Created: 2021-07-18 00:58:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: aa296e9513628f7a6f6d25bd93d3aa17 SHA-1: 20d2b3283c0e57bb7164dd7324f9f14c31171fb5 SHA-256: a6cf5991e9b0fb803e4142e5ba46a0c9a09ee2be26ebae8202de4241de92184f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The file is a PDF detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to host or distribute malicious content. The presence of numerous unknown URLs associated with compromised CMS uploads indicates a likely phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/36378c0472279d907f9d3ed8687c9713/rujowuwugoletosaravezeki.pdf In PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/mamalusa.pdfIn PDF document text
    • http://candientuvibra.com/images/file/jidavakolegazefe.pdfIn PDF document text
    • http://hanarotalk.com/userfiles/file///zaguparufikopi.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e730adb43a---61099994727.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/bh80geti66qk6lld10tfdtldjf/21073229293.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/48404495281.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/wabodepipolazufufexudelu.pdfIn PDF document text
    • http://pandoreunion.com/clients/81456/File/26586652171.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/86021403613.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073691d9d230---verofuzewadoxex.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/jt15f825bs1330jethsui4v7l5/jigenap.pdfIn PDF document text
    • http://gingerbreadvillage.org/clients/e/e3/e396b250b60561adcb946853f9f62e29/File/35006313185.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/31f89d7a766d8857d650d89f940613ca/xivedikuzaguxosamet.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/7182852977aecd042eccf653b9181166/81802397460.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/67647468212.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c7bbb7d06af---92774574068.pdfIn PDF document text
    • https://thietkeweblongan.com/upload/files/bojuzofu.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/e97b2e9b9f312afb1465fea9272c53b6/ziwafijitaja.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee7e765e30---95856262356.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160b64a6a10948---gedunojakowani.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/59c735a6ac3da35583b3d1214ca12f6e/mowinarati.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=real+numbers+10th+classPDF 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_off0000ffa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA3 10740 bytes
SHA-256: 73127b13dac53f0e7e6f373aed0bbb48c1e4691f619a2497486de0e179546973
font_01_sfnt_off00011832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11832 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13044 18084 bytes
SHA-256: 1b19f3ae82db2d15c3264916171220d66821614766cff66e6d58ff76954d1d04