Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d54539307130278…

MALICIOUS

PDF

83.1 KB Created: 2021-09-14 11:31:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 047fd0e3ec0e92aa101a5bb51034fb45 SHA-1: eca3074d3f1d36d139fd9f5913fde68f24ee4d75 SHA-256: 3d54539307130278bd811c3c0534e87b7825b7ea9c6de3588f4ab79e09f35ebc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm for SEO poisoning or phishing. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://a2designbg.com/userfiles/file/silusefunof.pdf In PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/11040493106.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/85222343227.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614038e1d1100---bidodakar.pdfIn PDF document text
    • https://patidarpalanpur.com/web/k/main_admin/ckfinder/userfiles/files/wafenaromezof.pdfIn PDF document text
    • http://mldom.xyz/web/img/podborky/files/zijurobizitojivudu.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/naluxezewuga.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/fagowakemanamugipale.pdfIn PDF document text
    • http://taihegas.com/filespath/files/20210908122709.pdfIn PDF document text
    • http://siamintertrade.com/file_media/file_image/file/56871282392.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613c62213eb13---xaboda.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/90067746417.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/72926589911.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/44751379218.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/32039116203.pdfIn PDF document text
    • https://almentispharma.com/ckfinder/userfiles/files/tosadokukilof.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/70536634959.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/161384617b7e22---detogaxupujipeganada.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/4fdbdbbef30becbc92c2584149567dcd/58926018335.pdfIn PDF document text
    • https://mandarinusa.com/userfiles/file/1630631964.pdfIn PDF document text
    • https://dottoridegregorio.it/public/file/wezeduwizarofeloj.pdfIn PDF document text
    • http://regcureguide.com/files/files/sogifarirut.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/78654328282.pdfIn PDF document text
    • http://ryyw.com/upload/files/2021/09/202109141414272760.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=send+location+on+androidPDF 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_off0000e113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE113 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f92a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92A 10268 bytes
SHA-256: 7e29f26f3fdc37931c5a14d25440e7454e876716c3e4cfa0e3584cb63f7594ea
font_02_sfnt_off0001105e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1105E 17664 bytes
SHA-256: f88a4e89a8a6da69ad540220a0500fee1a46d287428f126ca0253d83ffd576fa

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