Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ea1bb8629458c23…

MALICIOUS

PDF

75.1 KB Created: 2021-07-27 01:31:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: fd00fd309f3bc982c5791bbfa9e1dad3 SHA-1: dc57407604d0c21479b46e39cbbdf0490f5a9147 SHA-256: 5ea1bb8629458c238c318e3efd4fc7695dcadb4e3858df95fe2b44aaba9d69e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://aldea.work/wp-content/plugins/super-forms/uploads/php/files/00d5f32d1b2af84b8e5d1de165a9ea11/64358272713.pdf In PDF document text
    • http://hpc1970reunion.com/clients/3/3e/3eb4c5728feca7eb79feed4eed44c519/File/30376839379.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210726200245.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/jg01aprkbb5okp3jumon7e2j6h/deruwajakupasoliruv.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a94f3bcb45c---xaziruwaniniri.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/luvagug.pdfIn PDF document text
    • http://gamax-motor.cz/data/dokumenty/16673821771.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/1167989071.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/f3082e678a55045a7016751483bcb89e/55446102334.pdfIn PDF document text
    • http://www.hmh.sk/files/articles/file/72554308773.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/85578126630.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd4fc92c27---beranidepifufagebobiwef.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/rudakupexa.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/wekuselinid.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/d0c76eca77cff63da60e5fc0c21dc00f/65573419474.pdfIn PDF document text
    • https://anfauglir.com/images/file/5372811079.pdfIn PDF document text
    • http://italiancousins.net/clients/5/54/54f3d33123424807706abe9154268524/File/52885424006.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1609754ebd6e25---63263689709.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/2vfnb8ir035qjknv2ae9n66at1/23394023159.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ffc90da74---42456772455.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a23843dc9b3---bataruxav.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/fotibusagaxojisorib.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/zulakisiweguvumevuk.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/mipetevoxobibu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=letra+de+gracia+sublime+espiritu+y+en+verdadPDF 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_off0000c12d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC12D 11116 bytes
SHA-256: b6b1a626addb05ad1ccacd46e69e48d9e82299354539e10e296ccd201eab85ee
font_01_sfnt_off0000daad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAD 16992 bytes
SHA-256: f70ed40acec73aba744f0b2872d5d385a7dd9c1104b53e7865a4c31534bfe9d0
font_02_sfnt_off000105ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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