Malicious PDF — malware analysis report

Static analysis result for SHA-256 f55f816225c43e5b…

MALICIOUS

PDF

76.2 KB Created: 2021-09-21 18:00:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 81ee9797030b6adb1c653ff0a1ce22a5 SHA-1: 252cda2493e1e66acac0a22c79344c346d5dc8db SHA-256: f55f816225c43e5b874580629338916a3dad987eee6d091fef94f67b15bb4a82
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The presence of embedded URLs and the structure suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://boldogelet.hu/media/54864257452.pdf In PDF document text
    • https://westhygiene.hu/editor_up/32877672045.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/21i9p992dmc79vcmq5rf0v9ad4/lapitexakodug.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/42959393880.pdfIn PDF document text
    • http://camelliafb.com/uploads/files/202109130334429828.pdfIn PDF document text
    • https://bem-sa.com/img/file/69242238688.pdfIn PDF document text
    • https://hanomanberjaya.com/contents/files/4553691921.pdfIn PDF document text
    • http://insureavisitor.com/userfiles/file/70297401992.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/nupukuzelezutosidugi.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161415da9c136e---43919681474.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/161323a2756d1b---22753646305.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/litirak.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/munisej.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/futasu.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613240bb8ae4b---84248336550.pdfIn PDF document text
    • http://softtox.pl/new/userfiles/file/vamuxisizifulotegap.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/23663512944.pdfIn PDF document text
    • https://clickbox.ro/images/file/88034328822.pdfIn PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/57035172752.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e91d82872b---nidaxemudi.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/35040559490.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/0e0c73600f82f0e0f6cae0bcaa83b910/wazokexanad.pdfIn PDF document text
    • http://pactolous.hu/upload/file/66048823513.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/74624362097.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/99506863831.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=open+my+play+store+passwordPDF 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_off0000c31b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC31B 18480 bytes
SHA-256: d031bd68585f0496ca8c5db36f3323aa7c593fe882d129acdb058f216e6c9852
font_01_sfnt_off0000f250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF250 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A67 10688 bytes
SHA-256: 6ab1042df23b3c73ce7b1e478fafbbefb50c3ee33d181a6b2c31cd416314e2e4

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