Malicious PDF — malware analysis report

Static analysis result for SHA-256 93e65722e296fd29…

MALICIOUS

PDF

87.0 KB Created: 2021-07-04 23:00:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 9a1f1a3df869b3dd49c735750c4cae08 SHA-1: 93bd6765004b685ba6bfc511bd1ed3fc79b40bbe SHA-256: 93e65722e296fd2953f309684745b43d9269464d76d529f100bd232b52d1afaf
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains numerous links pointing to external resources, many of which are hosted on compromised WordPress sites or disposable domains. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, along with ClamAV detection as Pdf.Phishing.Trojan, strongly suggests a phishing or malware distribution attempt. The document body is heavily obfuscated and likely contains embedded malicious JavaScript, though it could not be fully parsed.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/b6c0015a2100d39fb1381cef670c788e/97841565705.pdf In PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/7849363068.pdfIn PDF document text
    • https://siahotel.com/userfiles/files/86816016489.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609047399ffe8---xogipuluwanowobur.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/a6ntn575cnp5nij08oc5rpptqf/19597320290.pdfIn PDF document text
    • http://lucidareemantenerepavimentifaidate.it/userfiles/files/50138170097.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/1g0n0b91tr5r5sn3bir1nm2cm3/linabawudo.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160909df478d13---64918892019.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/05i3sf19hlc4bv7g5vdep6e5l0/98436755272.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16089bb61373f3---pamuxakovomo.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/gutakan.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/6c944f8de2e360426886f6915d75790d/67263082204.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f691d55beb---bojafirikuduju.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///11335085792.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/ximonepagabufogitesoven.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/35460165165.pdfIn PDF document text
    • https://shibbirs.com/media/files/97075477377.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086c23456e2b---39578046715.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/rasinivojujuzizifoli.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc381af17d---76687816943.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/dd2704104b6402b8b0a61bb805e51ed2/36663208779.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/527b6c01091dc2f5e5ad0e346fb92af0/sokofenikalaruvamoner.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160949959379d1---ranoresalefoloxepuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=business+owner+and+entrepreneurPDF 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_off0000f19c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19C 16664 bytes
SHA-256: 458e67987d727d65f77e88beacbb0ef94b389bb3c2a28eb3af4e2fd25c84d3e9
font_01_sfnt_off00011cf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001350f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1350F 10576 bytes
SHA-256: fec7eedb470b15bea276d7d689b38c85c5d727d620dbcf3d92fc756acb9956fd

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