Malicious PDF — malware analysis report

Static analysis result for SHA-256 eadb320c3562f91a…

MALICIOUS

PDF

84.0 KB Created: 2021-09-19 19:18:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f8e73d7d65789a3eeaf1794228e25ec3 SHA-1: dbf702fd303da64ae46a79d2cb78b09ae0c60cdf SHA-256: eadb320c3562f91a7909aa78b83da5121718b08e8d973d43f7e81dfab0451f24
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to lure victims into downloading further malicious content or providing sensitive information. The presence of multiple external URIs and link farm heuristics strongly suggests a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://detectiveoffice.net/userfiles/file/25370549364.pdf In PDF document text
    • https://stijsr.com/userfiles/file/pilurupinesijugaxusizewi.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/nurosulogazagezurad.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/16145d5ec7f449---44518098833.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/73328978484.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/nixomadid.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/161316fe228a82---80722236283.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134db7b53b71---fivotararonenazod.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/59990007619.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/62792506781.pdfIn PDF document text
    • https://discovery99.com/userfiles/file/74960459787.pdfIn PDF document text
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/11873014474.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/kizedivomuvoxo.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/fevuludafomodojowo.pdfIn PDF document text
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/poloxanosigokuremifokesi.pdfIn PDF document text
    • https://www.oalysa.cz/ckfinder/userfiles/files/80005753623.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/91311319454.pdfIn PDF document text
    • http://escritacontabilidade.net/fotos/news/file/30245516387.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c48c22008---31704847271.pdfIn PDF document text
    • http://verzorgingsindex.nl/images/uploads/manizajikudin.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161438da6e1742---69086202644.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/74c9199855c708accce28811e6a24358/wefipabiriwotabajuru.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16130eac36f2c0---69848153583.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/nuxikopidi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=gta+south+africa+apkPDF 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_off0000e2fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FB 18156 bytes
SHA-256: 3ab636b25ce238dc1260b104e9627fd106f5bdde0a7033d4a391cb571345fd2a
font_01_sfnt_off00011244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11244 10524 bytes
SHA-256: cde3ffd1b942d12c99dd4a1c457ba5cc35a19d616a36fff7db9eb281c450b132
font_02_sfnt_off00012a75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1