Malicious PDF — malware analysis report

Static analysis result for SHA-256 29f5654cbb436ff8…

MALICIOUS

PDF

104.4 KB Created: 2021-07-28 07:22:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 76fbb7ee8dcc5ec4a748a52ff05d6fb8 SHA-1: f4c447761dc3e51a2d0bd05a1d9a46981b7c0c97 SHA-256: 29f5654cbb436ff84053b3f8d2e8d2bcc214a993b40cdc44dcadd83a64664f65
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and heuristics indicate this PDF is malicious, likely serving as a lure to download further content. The document contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution campaign. No scripts were extracted, but the presence of external URIs and link farms strongly suggests an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

Heuristics 5

  • 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://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4530ef31f---xejidagexifisupi.pdf In PDF document text
    • https://mama-light.net/business_school/uploads/file/xufugozixulojug.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/f0399e8f4c1a4647578a8fb1dfc2f00b/juzamim.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/48396037614.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/v7dcgsipi2emp3njcmkqr2d3q1/39067976130.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8b3054fb761c08817b2405e681e0512e/resakovivesuvuboriwidoju.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/piwaniradivibaxiz.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1298df11b---97129709113.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072ffd40939d---98780402612.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b02180b6560---17592626332.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da77dd2338d---70047614132.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/79518794751.pdfIn PDF document text
    • http://ncabhsa.com/clients/875427/File/bezomazaxosares.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d9399efe5---24322867950.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aff06060eb4---99582126227.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/bobuke.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160a222411da4e---17959942112.pdfIn PDF document text
    • http://bigxra.com/uploadfile/file/2021060918442873499.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ccfc132713b---kasirozunevevugumidotijad.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/a6013fab75c788cb644b7b9be924530e/xaxobemotodunut.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608064c002cc1---ruxolimezene.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606eff0797c92---90527784040.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d94b2e8d3---11823245278.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/vigudu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=bruno+mars+marry+you+video+downloadPDF 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_off000112e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E1 18972 bytes
SHA-256: 1eb00984012c95fe472965e8d42568579341ceb7972143c2b0ea8b41b21d8f5d
font_01_sfnt_off00014337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14337 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015b48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B48 18776 bytes
SHA-256: 3ded9aaca2ef9e6c6e95cee9882111b9cda0db582afcb602817e0619031ab472
font_03_sfnt_off00017933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17933 10728 bytes
SHA-256: 85b372e466960a1718b9e3bb2a5d50fc08ca89fcbc6e973b54af4472347ba042

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