Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e2d2abb283eeaba…

MALICIOUS

PDF

75.2 KB Created: 2021-09-12 10:07:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e57a5e613879a3da7fea0f0ca4cdb0cf SHA-1: ae14587125bd4d737b4f51f2390699ed23e258aa SHA-256: 1e2d2abb283eeabac19edaa25365f4acd0ac705cc63c9956866ef2218deaef71
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains a link farm with numerous URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://haltia.mx/sii/ckfinder/userfiles/files/gutivuwemefixek.pdf In PDF document text
    • http://debrecen.varosom.hu/userfiles/files/8978985625.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/vozabijivifuwavobenupuzik.pdfIn PDF document text
    • https://zaindu.drogomedia.com/files/galeria/files/xipivolexorabibarir.pdfIn PDF document text
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/22524480586.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/34401908652.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16138ec84123cf---rinonuparomotitok.pdfIn PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/233942535.pdfIn PDF document text
    • http://www.jasfec.com/imgs/uploads/16679837440.pdfIn PDF document text
    • https://atlantidegattico.it/file/98912797185.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/tubevozunamut.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/30484080873.pdfIn PDF document text
    • https://badrivishal.com/media/soposedelusig.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/11410872544.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/legubopimujifetuxiwuku.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/39658485026.pdfIn PDF document text
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/67578209748.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/5ce7a7jfv9auh8f8dh0956gmf5/11214716788.pdfIn PDF document text
    • http://salman-group.com/userfiles/file/51340649275.pdfIn PDF document text
    • http://techniq.ae/admin/uploadfiles/file/99010961778.pdfIn PDF document text
    • http://chukgoobok.com/files/fckeditor/file/76488687571.pdfIn PDF document text
    • http://cy2hand.com/userfiles/70007541226.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/131c89944e5154d4d0c31c4b7043d6b6/nugogobi.pdfIn PDF document text
    • http://gaushalango.com/uploaded_files/userfiles/files/94785018787.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=android+font+xmlPDF link annotation
    • 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_off0000c390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC390 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA7 10136 bytes
SHA-256: 09898b71d82ecb98784ebdadc16ff6233ea5e14d6cd54e2ca188a56e145f76cd
font_02_sfnt_off0000f230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF230 17288 bytes
SHA-256: 39d073eb18e9d2b92a346b3edf28aee6bf693bc20b1fadc1d2d8f256752146fd

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