Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4a71f1693ce78e3…

MALICIOUS

PDF

84.1 KB Created: 2021-08-20 15:14:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5320b2152a4400f09f5abd455fea20fc SHA-1: 8e7fad7cc70aff5754b2d2bf948923dcaadfab6b SHA-256: b4a71f1693ce78e3331d31c5a2ee8a0784601fafa5e681ff32dc85172f10a413
156 Risk Score

Malware Insights

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

The file is a PDF containing numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO abuse. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9783

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 http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zutowopakilowojoxagaxu.pdf In PDF document text
    • http://weberstellen.ch/userfiles/file/49741687552.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160f4a1d33ca01---25873843623.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/jedadaluwunug.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/af5a6f561619c45b7dedcd92f0225ba2/vizaro.pdfIn PDF document text
    • http://gewald.ru/content/Files/tosakiwijadaxitizoselo.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/bularifena.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16076f9072ae9d---46733053226.pdfIn PDF document text
    • http://anupbolivia.com/images/files/fexagapifok.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/14756755981.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f86494662f0---fozokiwu.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/5l01b9tgm7mf0ov0ogjmigbug9/jagibowowinuzemadapiguvol.pdfIn PDF document text
    • https://q-web.ro/wp-content/plugins/super-forms/uploads/php/files/558bc7u7qkfe8fl1op82556dn0/56271959048.pdfIn PDF document text
    • http://orthopediedelft.eu/files/75841076705.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107b1a0e0091---20865829334.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/202162084428785.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/5b39fcf4e840ecb9b0a149247c798686/tubofupukobuv.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/sedenepevewix.pdfIn PDF document text
    • https://topupdana.com/contents//files/ramitisokadexekipi.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/37254160638.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160bb6ba3c7504---makidamadopemegosukoneli.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1ff033569---xixidikawiludifuwapog.pdfIn PDF document text
    • http://charivne.info/images/file/65806315912.pdfIn PDF document text
    • http://penzionriverside.cz/files/file/24799226768.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/venepolenufagat.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/f7d2401fb577f5a3939ccadbcbf3469c/1392800825.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=agar+io+party+servers+with+botsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e31f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31F 16236 bytes
SHA-256: 9f9c9255c0426c77c5b13ef22f4242f4f7095bfd8ba808a20cf1712cd58ffb40
font_02_sfnt_off0000f8b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B5 18232 bytes
SHA-256: 873bb900a525bd92d692cd065f7004b688ea27c5b267ddc028e5c6d5bb01f8a3
font_03_sfnt_off000127f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127F8 10768 bytes
SHA-256: ca47f1cd9c815f8067d2cdb4ba199d3ba01185a3c7214fb9f10bc4ef5e8ccca3

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