Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9755677f149b8a0…

MALICIOUS

PDF

117.5 KB Created: 2021-09-10 03:06:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 700e2ef0868fb893d83a8de73a382a3a SHA-1: 4d1e430e21cf06f0701709c382fb26946f99b867 SHA-256: a9755677f149b8a0537195c40c665eac8e95cba45d39cb4194a4fa7cb1d2892f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://lemonsport.sk/upload/file/93234041290.pdf In PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613497b136e79---43176247822.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/risabawobu.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/fisusoposizex.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/65287733092.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/3phjju83k5fr64i8vlm0cokok0/vesot.pdfIn PDF document text
    • https://123natura.com/stockages/files/78232119556.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138372b48243---gobil.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/54147309916.pdfIn PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///keparojeji.pdfIn PDF document text
    • http://lagerunda.it/public/upload/file/69747945434.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/10410616192.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/37418007758.pdfIn PDF document text
    • https://granitnet.hu/editor_up/dufexino.pdfIn PDF document text
    • http://all-paca.com/ckeditor/ckfinder/core/connector/php/uploads/files/93047803637.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/1696972354f82295c0cba0085ca3f84a/senuvopunokamiv.pdfIn PDF document text
    • https://5of7edwardstreet.com/assets/media/files/marorosimiwebikuj.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/58890117728.pdfIn PDF document text
    • http://ldkxzzs.com/images/userfiles/file/latusobogov.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/ritulivotajosofo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=giochi+manageriali+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_off00016975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16975 17872 bytes
SHA-256: 8f7521aa89d1dcb1978f1d361e31ccfa1125ed8e1c6d42f670ca5ba34f64f2a4
font_01_sfnt_off0001987e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1987E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001b095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B095 10588 bytes
SHA-256: 1b8ec8e2d9c3f3bb1d0fd05ca9bc1964cdd76c5392ab3319f4e08d048c432a25