Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1d28abb46a5097c…

MALICIOUS

PDF

93.4 KB Created: 2021-09-20 20:56:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d98c437225f70a3902eb351127110989 SHA-1: 22914506c766b2c483ee88d8614ae262bdd08953 SHA-256: a1d28abb46a5097c2f1d31340632154da296e59243942e13795f900a636b5814
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs, including one that appears to be a phishing lure for hacking Instagram profiles. The presence of numerous links on disposable hosting and compromised CMS upload storage further supports a malicious intent, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 6

  • 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.
  • 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://chcial.ru/uplcv?utm_term=hack+instagram+profile PDF link annotation
    • http://messtores.ca/fck_user_files/file/91393348891.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/tifujaveb.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/vexudajifesanaja.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/diruruzitebipuxulisod.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/16294929185.pdfIn PDF document text
    • https://stauber.lt/images/files/kodiwalepetuxemokuwateto.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613881190bdc2---2398114228.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/mepedinufumojenepofixij.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/suporu.pdfIn PDF document text
    • http://antitumor.org/filespath/files/20210911021807.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/vomasuzuvonux.pdfIn PDF document text
    • http://m2m2design.com/userfiles/67924011902.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/44046709697.pdfIn PDF document text
    • https://rawoctane.com/uploads/file/mokubelezegeno.pdfIn PDF document text
    • https://tch.lu/files/files/vuwusixerizurirowibad.pdfIn PDF document text
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/vaterelefe.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc38dbae6d---gepukojinopot.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/kukaxogudufoxasise.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210901_4C5218DB0F45C687.pdfIn PDF document text
    • https://cqhuaan.myhost360.cn/upload/files/09-05-02-55-28-61.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/kisomapajakixeluka.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/d6a9ac4d1d18c058f01d9b0f53c192bd/kegabo.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/3621af854ff048c23b41cb431d77ab44/97321291978.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/badirupumevoz.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/lisugivalogopepanejuzowa.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161468027cb450---82279873768.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_off00010980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10980 17656 bytes
SHA-256: feb18274c9aab7a75febc89ffbece71cdef7d0360730c353afe4a6697515ad85
font_01_sfnt_off0001374a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1374A 10908 bytes
SHA-256: 65f3ea9851426482c216c5f6572978e06185d074b6d3cdbc985d00acd93be077
font_02_sfnt_off0001508a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1508A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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