Malicious PDF — malware analysis report

Static analysis result for SHA-256 f18364b880dc64af…

MALICIOUS

PDF

85.4 KB Created: 2021-09-05 00:26:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6cc1f8cb2a83d69f98a75d16b745d44c SHA-1: 5b3e583c00c96cb62510f1bc3f0e0eb855f17c2c SHA-256: f18364b880dc64aff3406dbaa95313a7f89c76cf03a8bcd676f54c87cd849e13
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The file's structure and embedded links indicate it is designed to redirect users to malicious content hosted on these compromised domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://ketchas.ru/uplcv?utm_term=how+to+read+a+person+like+a+book+pdf+espa%C3%B1ol PDF link annotation
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7cb523573e---tizaxulig.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160daa388b8084---xutesa.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/ced8589ee2d4e61f221c80722f300068/81924815400.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/pisiritanupabil.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2062493d24---gakujawolusidij.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ad6b90193---titemasinarutawisunis.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/0bed85e34bf9a2b0865780f4e7eb6c02/bodutotudegozetazisufugi.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/66642618521.pdfIn PDF document text
    • http://hangnhatbanonline.com/upload/files/79372611255.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a080d411d80---40917112525.pdfIn PDF document text
    • http://vote4dannybarry.com/clients/2/2f/2f5d4f67c16906f9b09010289963de11/File/sadeluj.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/2afil5hf3lgp46307u04fhkp13/31584705426.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/3tsjl7bdqifrmq8b7hftb8212v/xonepejezogiw.pdfIn PDF document text
    • http://nrgmedia.hu/files/file/xunidufun.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb284acf21c---vasodefanonitukamege.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160d3a49a7bbcb---54479192444.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/11971793516.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/8e9d3ac88e99b85454f48b5b7e591d3c/zegiloxoxud.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/80875269295.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160afebd7c99ee---wimevafedavakesopufu.pdfIn PDF document text
    • http://sro52.ru/uploads/files/jutena.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/5m1eim7seupeasbv88d70b29ci/pisugosimatimi.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16117c73ccf1b9---valoneduliravugiluk.pdfIn PDF document text
    • 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_off0000e613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE613 17788 bytes
SHA-256: 64a9c8960b40b8e5ea113ef9f96b666380989c9ae2b1224a80fdb24de0d08061
font_01_sfnt_off00011404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11404 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C1B 11004 bytes
SHA-256: 3e2cd790b59b3dea3b804369ce7c89c234bca297f0a3551ae548ef76e942de8d

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