Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef1d93a6db3b3901…

MALICIOUS

PDF

78.2 KB Created: 2021-09-17 21:05:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f981bb8d8b562835a6eea4f4e5477ad5 SHA-1: 3a3d4462f62604814423b1388f967ec8226cab33 SHA-256: ef1d93a6db3b390155ebee0b0e41e48bc6f488f00b075b68053e14d55488886e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript points to its use in executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • 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://queure.ru/uplcv?utm_term=download+pes+2021+ppsspp+full+transfer PDF link annotation
    • https://bkairconditioner.cloud4demo.com/uploads/files/34651555969.pdfIn PDF document text
    • http://anm-av.de/uploads/files/fufufopaze.pdfIn PDF document text
    • https://lesura.net/userfiles/file/bupefunufi.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16141df86e4d27---3411413237.pdfIn PDF document text
    • https://linker.tw/files/zofuvikegulevoruzubalemov.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/33917407539.pdfIn PDF document text
    • http://theexplorerthai.com/userfiles/files/buvezurixegebutuvusuk.pdfIn PDF document text
    • https://melz-feu.ru/upload/48627647969.pdfIn PDF document text
    • http://extrastyle.ee/ckfinder/userfiles/files/92294254349.pdfIn PDF document text
    • http://gaushalango.com/uploaded_files/userfiles/files/zobudifirowu.pdfIn PDF document text
    • http://imbirimbir.ru/files/88803408537.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7bd90fa7e---23987744896.pdfIn PDF document text
    • http://tagsu.com/attachments/fckattachments/file/23833981507.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/jevanadapa.pdfIn PDF document text
    • http://synfarm.com/upload/files/34244271778.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/tekofazovon.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/tatudeweriz.pdfIn PDF document text
    • http://ecoevopublisher.com/files/upfiles/file/mudizarofazotigosugagim.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/bifuzos.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/778ce125847e22399119f3632a238f00/84736059636.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/totumuvobagifitomavama.pdfIn PDF document text
    • http://guidesdugrandlarge.fr/images/import/file/78639637692.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/bunogagoretusatitetexilem.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/sugagedevipu.pdfIn PDF document text
    • http://carscaso.com/js/upload/files/xurodefovipalivobobidi.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/kagonu.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_off0000c94c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC94C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE163 10880 bytes
SHA-256: 0101a30ea11d821abbef9a28e6b2d709584cb419ef86a7d413e4fd6420d96813
font_02_sfnt_off0000fad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD8 18612 bytes
SHA-256: dba6d7ac41d975780540a78ef13838c13dc1bb210ea4228f5704257962460f61

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