Malicious PDF — malware analysis report

Static analysis result for SHA-256 c50a2bf94a1a64a1…

MALICIOUS

PDF

75.5 KB Created: 2021-09-04 04:48:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8015c1b2bf3230527071cac98c61e380 SHA-1: 97591143aab70a24ce5f2e73350350fcc76d13d3 SHA-256: c50a2bf94a1a64a144314487a3c70ad42886573f5c85aec044c37a48487ae4c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm heuristics, indicating it is designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for further actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://synerhu.ru/uplcv?utm_term=importance+of+learning+by+doing+pdf PDF link annotation
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d473693a9e---resuwos.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/sifexa.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610524fc91217---7927970625.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/25005698357.pdfIn PDF document text
    • http://moda-minulosti.cz/docs/momin/file/mifaxu.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-21/20210521030510849775.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/46762930472.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/33078156867.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/ramidekukalu.pdfIn PDF document text
    • http://ebus.cn/up_file/file/gademetajigijejazixef.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/04b6b1808c26260742cab607281c6550/78308027156.pdfIn PDF document text
    • http://tianfonmm.com/d/files/gasodujarobexawetemubagav.pdfIn PDF document text
    • https://pindimana.in/uploads/file/56484386938.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/4cdfd1473930205d79235e627a94d734/23385439220.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3c7b5da53---fikipevofara.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160efe4a45b951---14282695826.pdfIn PDF document text
    • https://igraonica.me/userfiles/file/guwevijavitefokex.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9c1f0c68c---16314632571.pdfIn PDF document text
    • https://www.allduniv.ac.in/ckfinder/userfiles/files/wavefuwilosurikefesebosor.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/rezotesiloxatevavim.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/dosanakezubebikirozereba.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/rewasik.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/goxom.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_off0000bd49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD49 11000 bytes
SHA-256: 931b392cf12e26fadc5fab370d7a0b6dd458f917aaa6f7b534b7657da50b57d7
font_01_sfnt_off0000d65e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD65E 20032 bytes
SHA-256: 47139d2b643443d33d19e9b29b06e6682bbb999524a7630e6d7f2315a455033a
font_02_sfnt_off0001088e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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