Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba34011987dcbc97…

MALICIOUS

PDF

84.4 KB Created: 2021-09-13 01:28:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a5b89b7677bfbf3958568f7fe72cfd9f SHA-1: 599805becb04751cfddd0b48010ad07e43abbf1c SHA-256: ba34011987dcbc97cc4db5e33725995f691a54f4a058f68190986d0825c1a437
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to download other PDF files from various websites, some of which appear to be compromised. The presence of a 'download button' lure further supports a phishing or social engineering attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pistant.ru/uplcv?utm_term=assassin%27s+creed+identity+android+apk PDF link annotation
    • https://wittnebel.dk/file/mozemeposelujobexovoter.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/5783901907.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a9b3ca7f3---11863783231.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/metusigalop.pdfIn PDF document text
    • http://cascad-trans.ru/files/gikuxopidowagobim.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c0c6bab18---zokan.pdfIn PDF document text
    • http://canadianartistic.com/userfiles/file/35827514876.pdfIn PDF document text
    • https://ntc-container.com/upload/files/96370174836.pdfIn PDF document text
    • http://samtle.net/ckupload/files/47638306709.pdfIn PDF document text
    • http://grabnerestriche.at/luwifo.pdfIn PDF document text
    • https://ptkas.com/kingkong/userfiles/files/90672511441.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/tavatejadokerajofop.pdfIn PDF document text
    • http://theseadiaries.com/ckfinder/userfiles/files/mixepesukobuxonuxode.pdfIn PDF document text
    • https://munis-roquesalbes.cat/demo/vilalba/imatges/file/57230564247.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/8s0057clvvsb5i5dqdket4ovaa/bejexajolavobege.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/zevawu.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/14974354868.pdfIn PDF document text
    • https://desco.scp.hr/files/xizufutujogu.pdfIn PDF document text
    • http://ksklinika.ru/ckfinder/userfiles/files/25849914729.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/raramokot.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb3df18fca---801994441.pdfIn PDF document text
    • https://gsm.company/ckfinder/userfiles/files/vaninarepiguxebosesu.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7d9aa3f0c---balufiwikixiwosujasutas.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/97023635712.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_off0000e486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE486 10680 bytes
SHA-256: 6e8bb7916084f24633058caeb5f78a4f46e45d30fafaeceba7ae870e5abc0e0f
font_01_sfnt_off0000fd3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3E 18132 bytes
SHA-256: 236d44bd86b3c799125ec8df64629bbd68f6af4e37b3f54ab0011ef3db75f9d6
font_02_sfnt_off00012b9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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