Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cad4144a722d698…

MALICIOUS

PDF

192.8 KB Created: 2021-06-26 10:44:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 80b882fe3b023a2f45f106cbb2ab6fbd SHA-1: d9e830e34ae2ced52cc9c31d47daff556576ff8f SHA-256: 0cad4144a722d698b4473ed092204a9aaaf65e2964963aa67b0c94785676969f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links to external websites, many of which are hosted on compromised WordPress installations. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting a phishing or malware distribution scheme. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment. No scripts were extracted, but the structure and URL patterns strongly suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9694

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 https://crysiq.ru/uplcv?utm_term=simple+stochastic+process PDF link annotation
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/he9f8rv88s060onnt8hpojk20o/pozakiwisuruluxo.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/xoxibuw.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e410c1ab2c---19008185716.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/takosesamijoloniv.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b03f7ad05a---6510041160.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/mdcbus0ka39gqb80csk1ev9bg4/89274203206.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/1getbgrudiec1vjlqd43jub144/rugodujuwuvafegekofow.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608081a5d142c---zuwuvazefilubujufibavewa.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b0594dcfb4b---rajuxipolidavebugobo.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/72935966625.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/76407102895.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8d109e9395---miloji.pdfIn PDF document text
    • http://szrealty.net/uploadpic/2021-5/file/2021052722472273499.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943904d0a38---tixozefipid.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc2b4fde0bd---65828944355.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/408d84d992109419493a0baf9d649936/xaniwewozodudifoxarisubo.pdfIn PDF document text
    • http://kardelendalgicpompa.com/uploadfiles/file/74340751898.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/jejpbcresbi6olkerev3a4u880/29040513815.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a63d3cf8b---vezolokobimatorop.pdfIn PDF document text
    • http://studioego.cz/userfiles/file/81406474286.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608353ccddb8c---torirat.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/cdceda83b279c1923aa4e2c5f6628d56/15733361200.pdfIn PDF document text
    • http://emannsltd.com/userfiles/losikatigalikup.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16076ef8e853a9---ximenakuram.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000274ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x274FF 22736 bytes
SHA-256: 7ba61aa245aaa0ee12fd45c22ce24d64f8dc16f8fd8d499fa35ad0c0330b05e1
font_01_sfnt_off0002af8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2AF8D 16084 bytes
SHA-256: 325c5f5cda05429ae92d15c23118ca1b8712e485108c584e1e30b0ff615913b7
font_02_sfnt_off0002c4b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C4B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0002dcd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DCD0 10608 bytes
SHA-256: b44a9c20e54331977c439f0560eb56fea03e658df958318abe550092747afda0