Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bf7814d85cbdf11…

MALICIOUS

PDF

81.1 KB Created: 2021-09-18 16:07:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 880ed53352ee23d7297c88a263cad3b2 SHA-1: ac67a95d463f9918857bde3479bd733ed639e126 SHA-256: 1bf7814d85cbdf1114ba6b548a2b105ffd42957443b2dff85f95f2106660ca2d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 https://wastran.ru/uplcv?utm_term=ludo+star+2018+apk+download+old+version PDF link annotation
    • https://ewdel.cz/ckfinder/userfiles/files/radegutakatijegif.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/xanalivekenetobevefu.pdfIn PDF document text
    • http://xn--aknmedical-yub.com/uploads/file/mubusix.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/18498035385.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb5e2daf9d---78089615250.pdfIn PDF document text
    • http://adice-area.com/pictures/files/21137135572.pdfIn PDF document text
    • https://4of100churchstreet.com/assets/media/files/kimates.pdfIn PDF document text
    • http://ministerium.pt/files/vanevarex.pdfIn PDF document text
    • https://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/19555190462.pdfIn PDF document text
    • https://www.hemingway.bg/app/templates/js/ckfinder/userfiles/files/durabamijoz.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/d0df3fa4a80da57b2dfc5034fbe66eb9/ruvazitajoninurakubaxiba.pdfIn PDF document text
    • https://songhong.info/userfiles/file/40411732515.pdfIn PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/vuxoroxofemexulunagebizi.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/70572781960.pdfIn PDF document text
    • http://www.farmaciavictoriayjmleon.com/userfiles/files/47749195913.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/sinuxevobodaxisomi.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/44500381854.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/8886779546.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/88779307792.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/9443002366.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/63394461794.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/patulo.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/78c4e4f2b6535147e1b1d57c44e580bf/20528855555.pdfIn PDF document text
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/kubexipabu.pdfIn PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/lapuruxowenaruzeveto.pdfIn PDF document text
    • http://hennel.hu/sources/elemek/file/43996713499.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/70fd5a2565785cb95a59d1a73d54fc18/wogaxevepaxafutesawi.pdfIn PDF document text
    • 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_off0000d557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD557 11188 bytes
SHA-256: 9eca29f7ee8801f699cfc10f50e829cb28870fcddcd96ae835dc0e296579b52c
font_01_sfnt_off0000efc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC4 18008 bytes
SHA-256: 78bd28f93a1f61096cff7e51a32a880ae037c3f3b5cb89b47264b524507f75eb
font_02_sfnt_off00011ead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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