Malicious PDF — malware analysis report

Static analysis result for SHA-256 93923c893cea28b9…

MALICIOUS

PDF

68.1 KB Created: 2021-09-08 08:24:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c9cab95269f34da67a005f9fbebc7524 SHA-1: ba0f4202dc788f1b334ea15de118799472f083d4 SHA-256: 93923c893cea28b978c04c8a2195b7ba8ed15d95118f85bf7ba296de552a967b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a phishing lure. It contains numerous links to external websites, many of which appear to be compromised CMS uploads, suggesting an attempt to redirect users to malicious content or downloads. The document body is heavily obfuscated and unreadable, but the presence of PDF_IMAGE_LURE heuristics indicates it's designed to look like an image to hide clickable elements.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://nationalshield-uae.com/userfiles/files/zuvifawegusuvikuxusipa.pdf In PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/783f241c513bcf1e882bbec2385041d1/xopariwotikapufube.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/eoiidf99p31a940s8emn9rjgdv/givotikotu.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/92094555389.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16120cf7d7548f---41297605022.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/fetezujudotijig.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/luvuvawebu.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/kakofukusew.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/3823463083.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/bb6a45jp0pml3cksiq054atrlf/66190061871.pdfIn PDF document text
    • http://nprofit.hk/userfiles/xerazevolufagujotezikudo.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/45215087005.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/sefululuvek.pdfIn PDF document text
    • https://dennismaloney.ca/upload/editor/file/xagamojolavipevot.pdfIn PDF document text
    • http://abc-tel.ru/data/File/7511252209.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/71481391926.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/8376fbfa42d78b58fce4dfa7662c3b90/wesowajimimadape.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210724_054245.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbc2a1affb---subabi.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/56741592280.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/wazif.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/4538965233.pdfIn PDF document text
    • http://plafondchauffant.fr/img/user/file/pofoga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=cp+plus+ptz+camera+manualPDF 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_off0000ae54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE54 14152 bytes
SHA-256: 182299372cf49e0b91888c64df6010a813b85f7a0bdd2c0af003316bd0f2d2f6
font_01_sfnt_off0000d19a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD19A 10512 bytes
SHA-256: bd5992d6cb1f6094a110769159bae24b5121f42efbb1004ef9e8267d7eacad4e
font_02_sfnt_off0000e99a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1