Malicious PDF — malware analysis report

Static analysis result for SHA-256 8df6ef0ab52f3cbb…

MALICIOUS

PDF

89.2 KB Created: 2021-09-03 13:08:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b96355b5f6d672a8bfb9a2162b08813a SHA-1: 14dc181712af1a24f654b838441b6b670abc11a9 SHA-256: 8df6ef0ab52f3cbb1a06b0a7d62403f288b96a00d8b005de0a62acfcbea5a1ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757d89a0d5c---66480805941.pdf In PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/ng40q4a158v7b6prbtcjdoq855/51313383528.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/48362754851.pdfIn PDF document text
    • http://df-foundry.net/d/files/bomijalugulusoravetasupa.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/gawirelawuzokorezo.pdfIn PDF document text
    • http://abwrva.com/uploads/files/82706867877.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/160791941e5e7d---jokasonenuretevu.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160cd98829af08---pisanuzixixiz.pdfIn PDF document text
    • http://kdekdyjak.cz/data/29527680219.pdfIn PDF document text
    • http://vejwun.cz/images/gijipoveliginenevidinasuk.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/4f07h5bol8n3638scan9udlue7/59267123608.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc42e1c7cb---26607661975.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/bsp9huqpafevtnfougmrmk1ktu/21039095353.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160916a2abf003---busuvar.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e8836e59c93---nasikijororejedezar.pdfIn PDF document text
    • http://interiorsexpress.biz/dayafter/uploadimages/newsimages/file/zuratoremowunagesa.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/adpl9s2jbvq9abtcb350i8fmes/68101398265.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/wuvemudixowinumox.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/090eda25a4644c3997bf9f16760c22f0/desonewuwomobavijukefov.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81828280397.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7c323d6c1---15252472870.pdfIn PDF document text
    • http://etyekilovarda.hu/userfiles/file/zejetezebejelotas.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/vubalawejamerunewagumom.pdfIn PDF document text
    • https://jf-orvalho.pt/userfiles/file/57774788776.pdfIn PDF document text
    • http://bocghebinhduong.com/media/ftp/file/78615786668.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=changeling+the+lost+2nd+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_off0000f9ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EF 10828 bytes
SHA-256: 29931dbea06f98afcda68e89f434571cad4f74ae0dfe7a2b2f3268ea689115de
font_01_sfnt_off000112b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B0 17332 bytes
SHA-256: d86bfbd46da98d84e845517a5fe2e21f016a4f32348cf98880c859ef73635321
font_02_sfnt_off00013f1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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