Malicious PDF — malware analysis report

Static analysis result for SHA-256 e99acb9684200058…

MALICIOUS

PDF

84.7 KB Created: 2021-06-30 01:42:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4b1cea3ee0553977ec21c921f1f35703 SHA-1: 18688eaddd5367ae2f00b72cd334e7cee38f4081 SHA-256: e99acb9684200058b521f733f2fce083fb1a8e4cd3deb224daeea6d2c8e0623f
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. The document body is unreadable, but the presence of multiple external URIs and the link farm heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701995c698c---28326678646.pdf In PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/r34d0mb25m8590otunl9rkter5/wuvezefivezixi.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160971a84b8850---jepizedokudiki.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/goxoda.pdfIn PDF document text
    • https://radio-aurea.eu/files/file/41756811861.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160873ad0f1032---pezagebuwozogogawo.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb18785e46---nomota.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b29deac30a9---risas.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/74f834bfe3f15ce2b931586dd8aba3d9/58971013991.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/5457036148.pdfIn PDF document text
    • http://labonscafe.com/userfiles/tojovasalufinifud.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/4779422856.pdfIn PDF document text
    • https://jambukuning.com/contents//files/budogaf.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/40c1b9dd41543d1f564e16142a56a1d6/86113454522.pdfIn PDF document text
    • http://rowanfamilyreunion.com/clients/28915/File/27506084021.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/20215111929411983.pdfIn PDF document text
    • https://codecs.ro/images/file/nefunepolojif.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/nikovomemazenos.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3cb800445---79140525694.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/bimomiluluzobupo.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608dea23af35b---56237994504.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=rseb+aen+and+jen+electrical+engineering+objective+practice+book+pdfPDF 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_off0000e738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE738 11268 bytes
SHA-256: 592c787425f1242f9019d5e3f376be4aaf29ca1638fe4a8e65a3ad4eb6d15a3a
font_01_sfnt_off0001016c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001197e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1197E 16820 bytes
SHA-256: 68c9f271460ed054f7a364bde8c59b4b98c98c1f6ca1785dbeed93d47e2e02ea

Open this report in the interactive analyzer, or submit your own file for analysis.