Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7d017bfece287b5…

MALICIOUS

PDF

90.1 KB Created: 2021-08-10 01:20:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e41c964dafce39432ead91591a82335c SHA-1: 1f8ee1b68a15704fb92bc15eb1dc5a1e3a9da8f2 SHA-256: b7d017bfece287b51a74c39dfc8c1307de0b0dd18ab9e6bb68394e01b8d675ed
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a link farm pointing to multiple domains, including compromised WordPress sites. This suggests the document is designed to exploit vulnerabilities or trick users into downloading a second-stage payload. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://baaningdoi.com/file_media/file_image/file/dixomakesulopejiribede.pdf In PDF document text
    • https://gruppopolidori.com/upload/image/file/18534327126.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d79833790---47349221777.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/69725306825.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be3935b292c---xiraxemilopelosizumuv.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/2475781250.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609914745f17c---fisivavisewapibagireso.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f046fbafa5---65161320165.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/dea0a2d733c1d1b5e123fbc64851f0a6/fometo.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/kefigi.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/nunapofejamufa.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c711d633be2---kiriwa.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210731_45683ACE1DAEB2CF.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16087a497dc3c6---xiduxavuzexo.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/1090684041.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210805111816.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/08700cd173273db7f2d2ab3a1fa81488/xikikojetu.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ad68bea17c4---59393537426.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160f6996641510---fetevolotuvogubazez.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610104a3904aa---14322620361.pdfIn PDF document text
    • https://classykitchen.pl/web/uploads/files/vezuxekexi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=facebook+ipo+roadshow+presentation+pdfPDF 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_off0000f9a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A6 17964 bytes
SHA-256: a39f2de1198455fb5e2f268a5307a75eb3e3f4c4c163e7a3b90172d24d15b2a9
font_01_sfnt_off00012932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12932 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14149 10964 bytes
SHA-256: 1e9d16ce221122eb5738cf82a54fe1b74fdde0c0f531947c417a009f25011119

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