Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c7189b08293332e…

MALICIOUS

PDF

87.2 KB Created: 2021-07-19 20:44:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 51de88395989c9895a1dd196e652e7b8 SHA-1: 0892b82e8677efa709e2a689eaef17752851a3aa SHA-256: 4c7189b08293332e1a73f5dff904469fd3ff8af118b8760ed94cfd873149a7d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites, indicating it functions as a link farm for malicious redirects. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/3fcf76a70f6b1096d862d9bf6c27f518/wabape.pdf In PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/2dce99e75a6d205507ead9b8f7b28e5f/51967512703.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/5srgkpq5n2m3u3gtovl8aeev03/kakanaradan.pdfIn PDF document text
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc63ebddb1---lagejupitofogepidafiw.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/3116c9d8d0b42dada79cf458d69941a7/semikuguponujawadede.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d224ad5a084---79146066483.pdfIn PDF document text
    • http://fullx.net/files/kewefi.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/lutal.pdfIn PDF document text
    • https://tavio.ru/files/file/tugajuraxekoneri.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/8fb16aea9ff8b1c49dbfbe6a135c3953/pufij.pdfIn PDF document text
    • http://orhs76reunion.com/clients/30721/File/1615015265.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf6e574e6fc---xinekalujitufodik.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160897c6f89c97---subegevuveg.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a0afc7ade62---81742388993.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16080377582726---nedoniwuboga.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/7r5s74l444ebs1dngakebq0bl3/zijanizonovo.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/4841af201b0cc6552c6bfe44a5de2912/jujoxepunuwibenavad.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/57971536797.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/12206319927.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/a6d37b84d3c1fb85ade879ae4a58c348/mulakizixegiwatujo.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/19632641401.pdfIn PDF document text
    • http://rld-carbon.ru/file/tolunedetikonez.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb38e15597---40199873192.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=home+invaders+moviePDF 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_off0000f35b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35B 17480 bytes
SHA-256: a43e74043758ff25ab09ce5c6906e13e33d567ed8f58f25937759ba099c10c17
font_01_sfnt_off000120c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000138db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138DB 10320 bytes
SHA-256: 7d166edf93f1ccb084374c18a0e35e2e32dce21bcea699c90c29843b06fb8275

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