Malicious PDF — malware analysis report

Static analysis result for SHA-256 38981e5acc4b2dde…

MALICIOUS

PDF

72.4 KB Created: 2021-09-19 19:23:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8073b055a3abaf5cde83068e75f228af SHA-1: e03b449bc0003082f29ea0108370ae84dacc2cc0 SHA-256: 38981e5acc4b2ddef928f253689697edb347870c1caa87bf0751ef87a94fc543
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://thrifty-uy.com/files/others/perevixatofowigamo.pdf In PDF document text
    • http://positiveforce.in/uploads/files/sonoseguduzasek.pdfIn PDF document text
    • http://xn--80aesyq.xn--p1acf/files/file/gebijefawile.pdfIn PDF document text
    • https://9ja-bet.com/userfiles/file/lodunewabokeg.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/30152191743.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/94375062268.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/f4b8bb6621d446f786bd3330d5c3baea/xonurebev.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/niwewawiw.pdfIn PDF document text
    • http://ptichile.cl/userfiles/file/varez.pdfIn PDF document text
    • http://abwrichmond.com/uploads/files/lokapidelisalij.pdfIn PDF document text
    • http://urs-certification.com/gais/image/file/97810891746.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/3dd7f58aeb26358b7ff64fefbf169e1d/rusaxakipatadexonebosov.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/23406290772.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/sosin.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/68347208501.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/64510081482.pdfIn PDF document text
    • http://ebrinteractive.com/userfiles/file/vetabosibafazori.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/69974158727.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/m2iq5jo0s00lqansrt8v0ujcuo/45582278445.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/zobanaviwapesenakiwuw.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/10c8e03cdef73374eaa36e79e998fe6e/bewanugelu.pdfIn PDF document text
    • https://halkum.rs/files/78314007877.pdfIn PDF document text
    • http://yoga-privates.com/yoga-privates/file/49645065222.pdfIn PDF document text
    • https://minjar.mebel18.com/uploads/files/marago.pdfIn PDF document text
    • https://yuktogel.com/contents/files/nozepan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=dil+diyan+gallan+movie+available+onPDF 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_off0000b8c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8C6 16784 bytes
SHA-256: da74d5fd14ee126e38c072072356b91ffdebb997069492fa0664e25d5d6e1987
font_01_sfnt_off0000e407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE407 10544 bytes
SHA-256: 37c90ef334369eef2d10a2e8e084ac139ae429ef62853bc559b291c2d690d59e
font_02_sfnt_off0000fbc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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