Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f518a3d11f42f77…

MALICIOUS

PDF

87.0 KB Created: 2021-09-11 08:26:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 69012e517b2a50565740a09ebacbe2ab SHA-1: 3a0d994f9696a65632f1db70fd2103450e032b06 SHA-256: 6f518a3d11f42f772f161ae39c976723086c2781331a61179cf6c0ff6838bfe9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous domains, many of which appear to be compromised CMS uploads or hosted on disposable infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure suggests a malicious document intended to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://massintech.ru/img/outer/files/93851729314.pdf In PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/79e957b09cec679602e5fe6af4ed882f/57417971600.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/75606554470.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/3406778191.pdfIn PDF document text
    • http://airzo.net/userData/board/file/fofelomezozopuwubaxo.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/83eb0dabd4629fc067deb5b6bba7d179/26011834629.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/zafusejugo.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/fuparomivukupax.pdfIn PDF document text
    • http://www.examnotice.in/uploads/files/27916803857.pdfIn PDF document text
    • https://pmms-online.com/assets/file/2431526095.pdfIn PDF document text
    • http://kup-vino.cz/web/ckfinder/userfiles/files/41879711469.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/11677328249.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8f077e87b---2986584160.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/56bdrb2so0mjtjbl6sq7s09j6i/nejijutotunof.pdfIn PDF document text
    • http://xsjsbzrw.com/uploads/files/13545825766.pdfIn PDF document text
    • https://gabconstruction.com/ckfinder/userfiles/files/49925678841.pdfIn PDF document text
    • https://network-italia.com/file/36072904360.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/97722206200.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/45017570542.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16131a6d10bd20---25296821162.pdfIn PDF document text
    • http://naszemotyle.natura2000.pl/imgturysta/files/53251713748.pdfIn PDF document text
    • https://isagrinio.gr/userfiles/balefisupamuzifivitososop.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/wigukilire.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/rufosurilumugiweluruvel.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/sikaritilumoxalil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=unturned+cot+idPDF 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_off0000f2e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E3 17376 bytes
SHA-256: ac87e8beb8f98a93a797379f211ab7d4f528afd33c0e4713a17ec9b2ab5c84fc
font_01_sfnt_off0001201e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1201E 10096 bytes
SHA-256: 69f424fab88e8dcfcd61f0b9e0456e1ea1877729850aab4736ae217bb45e2bb6
font_02_sfnt_off000136b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1