Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea2aaa05e09f8f81…

MALICIOUS

PDF

87.2 KB Created: 2021-08-06 07:25:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 95fe34596021c2c7b63789f602a18c01 SHA-1: ebec8cb082158cc55b82a7c0c90a68944d335f38 SHA-256: ea2aaa05e09f8f81bef6caf1efa355e57353b4ab240bbd6025201a8aab1b79a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution attempt. It contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, characteristic of a link farm designed to redirect users to malicious sites. No scripts were extracted, but the presence of multiple external URIs and the 'link farm' heuristics strongly suggest the document's purpose is to drive traffic to potentially harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://robinsonsmithreunion.com/clients/879094/File/juxitebafilebofosi.pdf In PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a416eca9d2e---tinixabapilatumitolubapub.pdfIn PDF document text
    • https://siahotel.com/userfiles/files/34354283258.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/29826817062.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9abb2cbb4b---752246799.pdfIn PDF document text
    • http://cuahuyhoang.com/media/ftp/file/14157454231.pdfIn PDF document text
    • https://majubesar.com/contents//files/bajawoser.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/87525656310.pdfIn PDF document text
    • http://flirdining.com/uploads/files/49265104018.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d236808b66---turiw.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/9fa826e05108549d5c38e95de74de9ab/63806519386.pdfIn PDF document text
    • http://bookblog.kr/data/file//files/65291402780.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/p873oa94ehf6l4vc9q5o9cs8d2/kenesoxijakulivujajotugus.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/wunoparokuwix.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/lewumikesopitap.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/71060311667.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/a0b492ff73fa14c31d8f1d67f45e22b2/61860072197.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc53a2359f---8107862172.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/rigesevaxorig.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/jalazefo.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/77767745962.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3e3ad36b8---2623564675.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608def5bedf10---kekebeviwiwozobevom.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/bcfb7dbd1c47f3287b1a8ed814f4440a/dedopagiveruse.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=ews+certificate+application+format+in+tamil+naduPDF 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_off0000f061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF061 16940 bytes
SHA-256: 1f09910ebd7b71501fc1a0f4a0642b83af9c14f7280b79618704cdb8a97e35f4
font_01_sfnt_off00011ca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA6 10948 bytes
SHA-256: 4358bf1ad8cb294567cb4e417b8d576a1b5a7f97bce023cd25c4003e9cff6f5f
font_02_sfnt_off0001360a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1360A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1