Malicious PDF — malware analysis report

Static analysis result for SHA-256 57176245e2a13ce1…

MALICIOUS

PDF

68.7 KB Created: 2021-09-16 10:51:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c55a69fef24fda6e9bd3f9d4f0b1df6d SHA-1: e0c865525ebf33362d2ec91cd12efafe6fc7318f SHA-256: 57176245e2a13ce1b6ab499be928bc716e832277e277a9ea213e08ef7459f68a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple compromised websites, suggesting an attempt to lure users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://huntic.ru/uplcv?utm_term=android+widget+customization PDF link annotation
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3fd302309---xebuduzajedefa.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/52886871236.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/s27je8it5d5inkrkb0ccbm9210/riwavuvu.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/94796748820.pdfIn PDF document text
    • http://inbiosa.eu/static/cfiles/files/jinavolaj.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/wimoxikeravom.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135919fbb43f---kofusujirivofevixiweniful.pdfIn PDF document text
    • https://jazykovytabor.topenglish.sk/app/webroot/gallery/files/64227791077.pdfIn PDF document text
    • http://vetsnab32.ru/userfiles/file/50328760822.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613301936958d.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614266f84bc83---20185528559.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/fidike.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/zipanebamibogix.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/koguposeroruxagigurotuju.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/lukeseg.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/68158778933.pdfIn PDF document text
    • http://www.slappedtogether.com/editoruploadfiles/file/57489028725.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/u69d0ajqsd81ovfp7pr3u6ccq3/47797714015.pdfIn PDF document text
    • http://kreativitaet-stadlhofer.at/global/images/userfiles/file/76350488583.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f837c995e3---jekuwozomeniwoziruki.pdfIn PDF document text
    • https://myreply.mobi/snappshott/editor//file/vobosi.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_off0000aebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D4 10896 bytes
SHA-256: a7cb195988dc925aef9626d45ea3b8015d67ad5f852b8a96267cd9d35a2584b2
font_02_sfnt_off0000dff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF6 14948 bytes
SHA-256: b3bb17a156a572b89a9b3c44d32a6ae945f604ab9571281cebf6400c705fce53

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