Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d6309f780e4e8c1…

MALICIOUS

PDF

77.9 KB Created: 2021-09-12 02:36:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ac85fa4a0607a8bf6e29a5d56dd53030 SHA-1: 23968a19cf3fb8e839c30807b451d93fe3480b52 SHA-256: 8d6309f780e4e8c110a2df7e52c6b49238c9962f0449dca9c0e88ca74d824aae
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://allytemp.ru/uplcv?utm_term=car+robot+simulator+mod+apk PDF link annotation
    • http://due.pt/js/ckfinder/userfiles/files/57137382032.pdfIn PDF document text
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/65676423132.pdfIn PDF document text
    • https://ubitanduk.com/contents/files/29043718262.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/1069446729.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/9315263289.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/pepejemas.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/647417cc4b9b2049372117cfe5a8f34a/96377339691.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ebde72eed---gufupajudanizakaxo.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/5565c30f37b6dde9e45d48e0d9d0a3ce/90666758021.pdfIn PDF document text
    • http://moscreen.in/cmsfiles/file/mebazivuzusavizevejuju.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/63267606262.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/14029629433.pdfIn PDF document text
    • http://tythb.com/uploadfile/files/sanezodivimavepefu.pdfIn PDF document text
    • http://socukorglutamatmentesfuszer.hu/ckfinder/userfiles/files/6663238361.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/74249064055.pdfIn PDF document text
    • https://okinawa4d.com/contents/files/tadidajemu.pdfIn PDF document text
    • https://komunalno.vrgorac.hr/files/zixapifunu.pdfIn PDF document text
    • http://fygl.net/uploads/file/080850574698.pdfIn PDF document text
    • http://www.ddu-hk.cz/ckfinder/userfiles/files/sanudi.pdfIn PDF document text
    • http://olympicburger1988.com/uploads/files/69531265764.pdfIn PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/39954229423.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/fakitipameguxefe.pdfIn PDF document text
    • https://gtijsr.com/userfiles/file/ponavobavunixogazepa.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/88663794387.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/kadipizumupulonurowirel.pdfIn PDF document text
    • http://manu-transport.com/documents/file/23875340375.pdfIn PDF document text
    • http://talentfuturesservices.com/sharpinstitute/images/files/1046804942.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_off0000c92a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC92A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e13c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13C 18468 bytes
SHA-256: daeacfa73badc1da1faaf1263bb14e5d0d85c47a9dd5ffcac767ac607cf31c01
font_02_sfnt_off0001117e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1117E 10680 bytes
SHA-256: bfbba7a2308556dc9eda8421f91ce78ae7e80fbab1396843319073f49b8711e8