Malicious PDF — malware analysis report

Static analysis result for SHA-256 a653c910ccb01344…

MALICIOUS

PDF

85.3 KB Created: 2021-06-29 04:21:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d46053f2398d724a9424111d899bffb7 SHA-1: 45c7727a8c6619b5751b337403c57ef3ed839832 SHA-256: a653c910ccb0134456542313f9081f50f1c5dfaa3356155cbfcc756f9278e8a5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which point to compromised WordPress sites hosting PDF files. The 'SE_INVOICE_LURE' heuristic indicates the document's content is designed to mimic an invoice or payment request, aiming to trick the user into downloading the linked malicious PDFs. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a secondary payload or facilitate phishing.

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bf1c921ac08---98475065911.pdf In PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfba44e471---29598498697.pdfIn PDF document text
    • http://hocikto.info/userfiles/file/xanogegetagod.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/suwarijewugesituxiburuwa.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607974f942aad---rilizijofopopupamivup.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/627hp833puc11hig6iht068jk0/xopixevekeferusunuloru.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/78058305323.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a63908dead2---wojubojexuvukabilumore.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/4478bda2fb72230354bbc68494e82cfb/bivunobibo.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16079a336353ee---lisitajik.pdfIn PDF document text
    • http://tencanpowder.com/d/files/24246637920.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/leziguligugirixakijigapu.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a88cf2f35b8---lesewonumad.pdfIn PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/xurukusinorin.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/co32bche216hjatgaecb2au9g3/86139964585.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e84c7ba6b---64648694283.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/aa57b8c312ecfc521e460aef585818db/kanetimaguguw.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/lewarowadewiz.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160705aaa0ccbe---16430929624.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea131880a2---zoruvo.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/85611584014.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/topibavir.pdfIn PDF document text
    • https://apinero.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aaf425375b---nokozozafaxidizufufusuza.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dfc37ad53d---zururi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=printable+airline+ticket+template+freePDF 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_off0000ec86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC86 10588 bytes
SHA-256: 13f84666b3c19fd5886b0f2292f85c1b96fad3f82b56d5723ab786841d9cfd92
font_01_sfnt_off0001046c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046C 16796 bytes
SHA-256: 64644191d3de5d1d5fdef1782dd3feba6973457b0afca5d1bfaaa71eae2caf7a
font_02_sfnt_off00013004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13004 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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