Malicious PDF — malware analysis report

Static analysis result for SHA-256 38f1391e7b5ca466…

MALICIOUS

PDF

82.1 KB Created: 2021-08-17 18:20:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d1a8727f7b7f307fc1cb8c169b2160f6 SHA-1: 9c17b1630cc45ab11ec08cc1c1c0e78d65a60bda SHA-256: 38f1391e7b5ca466942c64bb3d6f9040605c9cfa921f84f34211ef09f8e16dda
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://laborke.ru/uplcv?utm_term=dead+trigger+offline+mod+apk+free+download PDF link annotation
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610eda1e6d8ce---71139928696.pdfIn PDF document text
    • http://matraholding.hu/images/userfiles/files/senikibur.pdfIn PDF document text
    • http://twxcd.com/img-aim/files/kiwobodediperu.pdfIn PDF document text
    • http://bangtutrang.com/upload/files/22994887990.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/6cf538d3d0d4bf0ed379517a72f69c7f/75993407298.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/nixexilatanosoxepo.pdfIn PDF document text
    • https://tahubunting1.com/contents//files/porolereteli.pdfIn PDF document text
    • http://bptramptour.pl/files/file/vevufeteredovexed.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/sagegugadaxuza.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/janupafapinesiwanuxowe.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ee7e499c033---rudotosirasuvis.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/e34a5f2e3c79366175a6846684d7033e/47042174167.pdfIn PDF document text
    • https://xehowo24h.com/images/ckeditor/files/90398172059.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/d1a69be883bdd4bea58ccc714457c2cf/34938895581.pdfIn PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/18512156913.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/qcaij6r3dunr23unup5nftg6sh/pimideruwujurito.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f02faafe43---47717739989.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16083dbd2e5d2a---jolexazug.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a172e2ef5a1---37421852548.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/xopomabokujefizogeb.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f80b6d8c74---tuwubineruledevujimibosik.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/8470d58478b8038bef4ee32d0c846828/gafenezerasejeseda.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9718ba7ce---fonujugodowumexamomow.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4add55ab31---34008370045.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_off0000e005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE005 10852 bytes
SHA-256: 687bf7456c61cd17cf946bb81daeeb2779abbad1412df3a4fa73bafb864fd988
font_01_sfnt_off0000f8d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D2 16288 bytes
SHA-256: 1f5e7a4d31c8557831df414c469f2824ba57865f8b244bd4e8cbade8da05ab01
font_02_sfnt_off00012310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12310 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1