Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2dbef2d3a972740…

MALICIOUS

PDF

71.3 KB Created: 2021-10-01 21:08:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 32f19f7cd1d4b40de006d4317263a9da SHA-1: aa008f99790880ab4bece4cfc6a47e1d7b2754e7 SHA-256: b2dbef2d3a972740fb2bba38f763477a0c6b670a9f976cc9568402692ef6f551
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Numerous heuristics indicate the PDF functions as a link farm, directing users to various external websites, some hosted on compromised CMS platforms. The presence of external URIs and link farm characteristics suggests an intent to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://irlanc.ru/uplcv?utm_term=modern+bingo+calls PDF link annotation
    • http://bezpiecznamlodosc.org/files/file/12510620726.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/sulugiturozew.pdfIn PDF document text
    • https://beeshark.ro/app/webroot/files/userfiles/files/33713865893.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/56112461233.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/mixipemovoruv.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/88253986837.pdfIn PDF document text
    • http://goopenapp.com/uploads/files/kuvafirananakegifaruzobu.pdfIn PDF document text
    • https://rakbah.healthybitespk.com/alpha/ckfinder/userfiles/files/xepomulas.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16156e7fe3a074---57914527555.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/08199a556edfac2ada9210c28c399a71/wavogegilobiramamoberu.pdfIn PDF document text
    • https://tuinvandecruys.be/file/57044410791.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/161532ec69288c---37232606282.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/765fd7971e8fa43ddca68f13db88ff87/14559067669.pdfIn PDF document text
    • http://kahasat.cz/data/file/vawepire.pdfIn PDF document text
    • http://koala-al.com/d/files/rulon.pdfIn PDF document text
    • http://justsayhi365.com/uploads/file/3885808069.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/65896394421.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210907_33AD2E6E7946240E.pdfIn PDF document text
    • http://dealershop.es/camarasegovia/userfiles/file/41370519571.pdfIn PDF document text
    • http://akwarella.pl/user_uploads/file/70888780718.pdfIn PDF document text
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/13916913499.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/narugijosowapaxuvaga.pdfIn PDF document text
    • http://faizleathergloves.com/userfiles/files/dexonud.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_off0000b3b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3B3 17372 bytes
SHA-256: ca23f0a8f74bbb995a8ba4b547d5de8cdce248c9eb2a8667548ce12c231d49de
font_01_sfnt_off0000dffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF813 10580 bytes
SHA-256: fd9bd850216402b17c295716340d979f5141389930ca425ca16aa1443ca3c845

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