Malicious PDF — malware analysis report

Static analysis result for SHA-256 e904843138d25472…

MALICIOUS

PDF

88.4 KB Created: 2021-08-13 21:03:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 60d21b4fbde40299732b27f8eb8a1e48 SHA-1: 3e67fba8d3c2d6744d04cf8d5395b5ad3eaf2fd0 SHA-256: e904843138d25472853e23c0243730932950d795e4c9370cb1b18a920b5e8765
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a machine learning classifier and ClamAV, indicating it is likely a phishing or trojan distribution attempt. The document contains numerous links pointing to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and link farm nature are indicative of a phishing lure, potentially leveraging embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://garglob.ru/uplcv?utm_term=libros+mandalas+para+colorear+panamericana PDF link annotation
    • http://calisnt.com/uploads/files/gejoxefurig.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f06ba41d5d2---nidaxudelugebadepefebemu.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/36091763648.pdfIn PDF document text
    • https://roc.mn/uploads/files/79683028649.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/89854678253.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9e66375ef---baxomuworajopavawonako.pdfIn PDF document text
    • http://chromatographvials.com/d/files/xagutisux.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/74293278576.pdfIn PDF document text
    • http://pagyesa.org/userfiles/file/20210607091142.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/acede173e8e66994ca40c8300eec816a/pajarerikebolutevixa.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/4a555890e691c8e4703e8fb688814ebc/nimagevupagumetazugafe.pdfIn PDF document text
    • https://ladangmimpi2.com/contents//files/78466920653.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/47677355800.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/78567097557.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/0c638e04b318e938a0447441847ad245/bagiva.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774adcc8243---78435187281.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/51360978387.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e0a8553c2---dilobu.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/29e5c54f81c5e1b5325db45f540638c9/rinexojefuru.pdfIn PDF document text
    • http://hotelbelleepoque.bg/userfiles/file/16104797776.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105201008096900.pdfIn PDF document text
    • http://voxel-avocats.fr/uploads/file/sizuzuwu.pdfIn PDF document text
    • https://keluargamimpi2.com/contents//files/besajosudatad.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000ccea.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xCCEA 21672 bytes
SHA-256: 19280e2a3e9f697b86d58e5d36b4a3ff63db8fbd9474aabbc44c01f6d8a894d4
font_01_sfnt_off0000f30b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B22 10676 bytes
SHA-256: 1c79cdadde603e6f9a25b1719f40f4e2994f1ea35e696824f89a09e9dfeed9b0
font_03_sfnt_off00012347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12347 17884 bytes
SHA-256: 338c7d44a14ad2848a1b8740a99645271466c846ddd8c2ece4dcd0eb8937a8e3

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