Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d1b7d6467a90267…

MALICIOUS

PDF

77.6 KB Created: 2021-09-17 09:30:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d5c41488e1e5eb501c6df75415ee398c SHA-1: 8e8854232372750d6e17854a4bf84ecd8cd8caec SHA-256: 1d1b7d6467a902672ee0dcea23d04c1676a5e77ea25935737c67c4ba9883db2e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and likely phishing-related. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a 'utm_term' parameter in one of the URLs indicates a potential phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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=only+fans+premium+free PDF link annotation
    • http://ticaproduce.com/ckfinder/userfiles/files/suxosorupinedux.pdfIn PDF document text
    • http://101balkon.ru/upload/files/863868686.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/wexamisimomofer.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/2196178233.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/76380461788.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/warero.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/b25fe222e7209e52ed772fb612dbcb65/morolobilotig.pdfIn PDF document text
    • https://imagebrandstudio.com/userfiles/file/rezofujenetuvef.pdfIn PDF document text
    • http://www.pratikchoudhury.com/fckimages/file/fipolubowebax.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/gokogewadenuwilemubalok.pdfIn PDF document text
    • http://nato-denkmal.de/uploads/file/wapivibovusezugemisaleniw.pdfIn PDF document text
    • https://supermovi.com/userfiles/files/66882957479.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/eab9336abf5c3d96469c84aa8b601e76/20773136461.pdfIn PDF document text
    • http://thecuriosityshot.com/48956207458.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de9b25b710---zumuxokenufukiwosogosore.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/kixixubew.pdfIn PDF document text
    • http://bodegaadrover.com/userfiles/imagenes/30056262033.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/zakobe.pdfIn PDF document text
    • http://ydyb.com/filespath/files/20210916185712.pdfIn PDF document text
    • http://thai-apsproducts.com/file_media/file_image/file/godisobefigaj.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/8232a0952321dba7fb0ae1d905ff41e3/69963304097.pdfIn PDF document text
    • http://huerural.com/uploads/image/files/29333616979.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/nogotefijogofovekujap.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_off0000cd07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD07 16952 bytes
SHA-256: 8750548e1a7b382ce9f398c81fdca793a28da1baee795f3dd86d1a945178a8bc
font_01_sfnt_off0000f8df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DF 10540 bytes
SHA-256: 6f366dc0e1089ad11e4d216cf03b9fece5543fb12b9892e01106b02fae3cba90
font_02_sfnt_off000110ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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