Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d2126a96be4236f…

MALICIOUS

PDF

70.9 KB Created: 2021-09-30 17:04:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 8c58427d069641add83bd108f91cbcd3 SHA-1: 2db404202f1c892fa7d683049504b05802e99355 SHA-256: 8d2126a96be4236fbd05f5a3b6257f4fb9fba5e906c16ea6d79b720972f76f49
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs that form a link farm, with several pointing to compromised CMS upload storage and disposable hosting. The primary purpose appears to be directing users to potentially malicious websites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://www.hippocratio.gr/ckfinder/userfiles/files/kawafiwinitawitiv.pdf In PDF document text
    • http://mtecommerce.it/public/news/file/29913729347.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/sagoradijoparamixativar.pdfIn PDF document text
    • https://vjlabor.pitscovn.com/uploads/Upload/files/kekek.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614acb3980bf8---53446973324.pdfIn PDF document text
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/58595293647.pdfIn PDF document text
    • http://baovecongtruong.com/upload/files/16380230239.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/lekajoxemujaperiwuvab.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/1450941584.pdfIn PDF document text
    • http://ort168.com/upload/ckeditor/files/dukorivapoxomuziter.pdfIn PDF document text
    • http://hooleihomes.com/cms_images/file/95161481786.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/30462073591.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd0738788a---tojirewadukixisinugipu.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/39480299927.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/subawisitefuz.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614b5b0e34602---46241216609.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/fofewak.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/17721796971.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/28307324601.pdfIn PDF document text
    • http://tridiart.cl/ckfinder/userfiles/files/18593223809.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131c7b1bf74f---21918154458.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/genurajolegebenu.pdfIn PDF document text
    • http://giftboxvietthuy.com/upload/ck/files/11029292292.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=ios+compared+to+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_off0000b373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB373 16920 bytes
SHA-256: 546c44a865001b82ad4e72c16bf1b9f0ab299a44dc0c559891eef474b8e50e08
font_01_sfnt_off0000de1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1E 10580 bytes
SHA-256: bdf19de8d96aadd49216187193a5c38ddc932e75053634d43338c6a1a476297c
font_02_sfnt_off0000f63e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1