Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d1e33907fda2c70…

MALICIOUS

PDF

91.2 KB Created: 2021-08-03 02:47:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 35217e6c1cc1b434ab9e218b1b9873ed SHA-1: bb64d41cc51b6443e0c32b920d13a819364d8696 SHA-256: 7d1e33907fda2c700301e3bbd27e1f0f1fe7fc22525cbd6d98a51e6ec41394ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF sample was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/e576dc8aaed069e6cd6b370e62c51683/nutanimowudege.pdf In PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3db9a7ff0---82825194299.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6baee457c---61442780994.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c4fe0f0d4a7---58439551977.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/64f699e29b8a00af13aabdf698c14039/95401057369.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/rinewutevurupadik.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6e3a9694f---rufotiriwojogo.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/zinujixenakoteperi.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a3b623179---bojuduror.pdfIn PDF document text
    • http://au-zlato.sk/upload/files/fefox.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607153f35f02a---givelenuvunaw.pdfIn PDF document text
    • https://marosme.ro/hirek/file/duxeronatogopalirozi.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/93594090532.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/86733339778088bdcfab0054684ed8fc/94092907981.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a01af931ed8---gerize.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/0cd297502341e1bc44218089930cb7ca/33589121965.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/60d0cd94bc8d82afb89d844d9b1da784/vubevefozige.pdfIn PDF document text
    • http://pcwest1980.com/clients/9/9b/9b13e9c1eb96aaf026ead536bb80a376/File/8710557250.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/45436004933.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/95322278815.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/1ts0cmgo7tjk2lclmlcpucq6jv/46428355248.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce760a33a2---52171901243.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/cac8c1a7d565192711e3556ce82d6331/genonedefutumimab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+treat+a+cystic+pimplePDF 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_off0000ff75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF75 10624 bytes
SHA-256: 7dcaeb5acd5010983f06715a5affddd88e7c74c1872aaa76c119af9f80ac1726
font_01_sfnt_off000117da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012fec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FEC 17264 bytes
SHA-256: bd957ecb18119a766c5e6c071448dd491fc75f29c077269c443ccf71213990c0

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