Malicious PDF — malware analysis report

Static analysis result for SHA-256 f18bd0c5de64cadd…

MALICIOUS

PDF

110.9 KB Created: 2021-07-16 07:33:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 18c36189d3c07e550695dd2e679fab22 SHA-1: d0085b6e613b400a0bd099b4b85c1377e0742327 SHA-256: f18bd0c5de64caddb3e11b887f62f559268fa5e85515caf10b2192ff85a95d9c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is a phishing or malware distribution lure. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://strandedtattoo.net/file/67256877032.pdf In PDF document text
    • https://affordans.com/ckfinder/userfiles/files/5651335684.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/ebbd643cdd0365fb71085c7ef1eecf93/78403156213.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/af259ad09caf371c30e6e80ace5bed93/pesezixegozazil.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/6b2b8e87b84bc3a11733f1c8dc6a5900/sujoges.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b57fc6e1cc5---govaxerozebulasa.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/62453053758.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9fc0ba98d---90845026733.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/f4n4prcuokoqh3c1hbbglc2o3n/91728152001.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/6d7a9a94f227ef788f4863544bdd26be/lesebokojodusewubulav.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/a8dfe79c771aefd6f8b46533c9f13a72/wurinapabujulizifulenuke.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/p9q19766tual5s6pb9bq19d7t0/nukarebigegini.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/gebupinupote.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/1646974736.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/b47783f99dc5bb9785c996cac04679fd/20923558276.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/gavolorekosusozagolakose.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbdab886be---mololisesa.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160745f67536d4---modetowu.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/33765577817.pdfIn PDF document text
    • http://webdulich.com/js/ckfinder/userfiles/files/giridukujew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=the+wiz+play+castPDF 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_off00014f54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F54 10368 bytes
SHA-256: 6c6744e304f7c7d208d01b784321b54b60262c5e7b446edd86b24706ada39b0c
font_01_sfnt_off0001670f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1670F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017f21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F21 18552 bytes
SHA-256: 059467f82ee0aa9b0e80e58dbd35daef6976b50a1b4282e2ce346b64f3f4b580

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