Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ac494885213fdf9…

MALICIOUS

PDF

72.8 KB Created: 2021-09-03 14:25:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9d77bb8a5875944c165874b7707d1200 SHA-1: 178b019109585ff22b770441e052ef164f144d1e SHA-256: 6ac494885213fdf9c5f2fd19527a918752d432a76159f73a508a87666dad0455
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress installations or appear to be on disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded URLs and link farms suggests the document's primary purpose is to redirect users to malicious content.

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://catamma.ru/uplcv?utm_term=unificar+varios+pdf+en+1 PDF link annotation
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4e7d5476b---89994854786.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/muloxaguwegiwes.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ab658d337---zujafetizitesijisat.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/69745015231.pdfIn PDF document text
    • http://barcelonahotel.vn/UpLoadFile/file/1118794218.pdfIn PDF document text
    • https://eviinstall.com/userfiles/files/15579833778.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/05b22288a5bdcc34439bb426b9220ee6/46096383581.pdfIn PDF document text
    • http://fairytaleweddingsandeventsbymary.com/clients/f/f2/f272f95a0afb65faa7304057ec0e56f6/File/26754259350.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/jifamabugif.pdfIn PDF document text
    • http://kuzfarm.ru/images/file/2627745172.pdfIn PDF document text
    • http://taiwangallant.com/uploads//files/202108120229417867.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/kobibanowewi.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/81708723537.pdfIn PDF document text
    • http://baocaosudanang24h.com/uploads/image/files/47780806152.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/moxobukudimadulolevadug.pdfIn PDF document text
    • http://photopuzzle.net/userData/board/file/40621180580.pdfIn PDF document text
    • http://xoblates.com/clients/e/e0/e08cfb93fb97b00c28394d0532709dc9/File/56890062791.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/8091125c67285e3251d2c2faadf1622b/boruz.pdfIn PDF document text
    • https://pasarangroup1.com/contents//files/povafejibag.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/sakazaz.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/86cba3e7fc86ad30c8c9dc7304f3f376/38403819625.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/51391733212.pdfIn PDF document text
    • http://benly-carson.com/product/files/51261742121.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/kerobikipuv.pdfIn PDF document text
    • 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_off0000b8c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0DA 10596 bytes
SHA-256: 5dee3f6febb41f81a84aca1068f36c5d39ca406b054d82bdd8d0078d3f33606e
font_02_sfnt_off0000e939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE939 17876 bytes
SHA-256: cde689cbc253915afd7acbd071167018fbc5df54734998cb7a3c9f38e6a4b373

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