Malicious PDF — malware analysis report

Static analysis result for SHA-256 a62e6a4f3f5e29e8…

MALICIOUS

PDF

78.1 KB Created: 2021-09-19 03:34:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 20b90fc9d52914e737aec38010ee368d SHA-1: 2cd1d7029bdf0cce47df7a766ceafc32aec7a18c SHA-256: a62e6a4f3f5e29e8df718f312ac442d044fc7f800fd4cda07c4bfb15d9725c37
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. The presence of embedded JavaScript and multiple external URIs, including links to compromised WordPress upload storage, suggests an attempt to download and execute a secondary payload. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass initial security scans.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://nomylo.ru/uplcv?utm_term=cannot+open+zip+file+on+android PDF link annotation
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16141da2c59d4d---54260818123.pdfIn PDF document text
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/mukudasorakuferegovexefi.pdfIn PDF document text
    • http://daisin1977.com/js/upload/files/35397482483.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/datixinawakekatemasati.pdfIn PDF document text
    • http://emiem.pl/public/upload/ckfinder/userfiles/files/8124772692.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/a63pss08kqld9oja6539do5695/71055245417.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/mewuxowu.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/46500609049.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/gufawegutipoligozakef.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131688ee4391---8359244125.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161433f5647a14---54268134567.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161467ff6a8919---45397181412.pdfIn PDF document text
    • http://palirna-frydek.cz/uploaded/file/nanumaligarigukolazutedi.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/95066956470.pdfIn PDF document text
    • http://www.drivingschool-brno.cz/files/files/galezugifetiduwebug.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/kilifadariral.pdfIn PDF document text
    • http://www.pro9apps.com/app/webroot/files/uploadimagesfile/luxekediwatix.pdfIn PDF document text
    • http://devitohomesorlando.com/userfiles/files/35127677385.pdfIn PDF document text
    • http://hantechwelding.com/userfiles/file/2021090501080573499.pdfIn PDF document text
    • http://na3.it/misc/file/koguwalowivedalenone.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/11922685935.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613142ed11de2---bofazaxuvabenuxulodiweju.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/zodewedavavajisibu.pdfIn PDF document text
    • https://signika.pl/Upload/file/15856925444.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_off0000ce18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE18 10412 bytes
SHA-256: cf16534198c3eaaf07eef4b8a287fe24fbbb574665537780da1f822df7e1b8fb
font_01_sfnt_off0000e5d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D5 17620 bytes
SHA-256: 02ca201e55bf3e893ee9e66aa42dae9c126ea4fbbb2a0f7fbb1e93f34cdfdf21
font_02_sfnt_off0001127d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1127D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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