Malicious PDF — malware analysis report

Static analysis result for SHA-256 c15018b0322d83ea…

MALICIOUS

PDF

70.7 KB Created: 2021-09-30 11:44:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e98ed3e6f8c5ea867bbac233a1303180 SHA-1: 0242551eeefe83670c07752e3dfb9c5a81c0493b SHA-256: c15018b0322d83eaf0e737e7c6476c96bc7e2fedc271287dc8f3cf760315324c
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress uploads and other potentially malicious sites. The primary purpose appears to be directing users to external, untrusted resources, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://alubiasdetolosa.com/files/galeria/files/38492116606.pdf In PDF document text
    • http://tongshengchem.com/ckfinder/userfiles/files/11874300574.pdfIn PDF document text
    • http://uzks.hr/upload/datoteke/zemuxijijakomupusebil.pdfIn PDF document text
    • https://chsins.tw/uploads/files/202109240410513285.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/90311318210.pdfIn PDF document text
    • https://cplastik.eu/data/cms/file/88100178595.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/c1791410130ac84c42736040f20ad2ba/jikuritibipowavonodevepab.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/1295264326.pdfIn PDF document text
    • http://www.tahi.hu/ckfinder/userfiles/files/90766986450.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/32518987144.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/9283786307.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/pozavijavitosavudej.pdfIn PDF document text
    • http://kapfenberger-schuetzenverein.at/userfiles/file/vaxigadivanogefevexejeb.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/3ef3fea9e07cb4c1b65e72d1005b0722/vipamabasupalojagosebe.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/7858ce5094fdc72752adae6ea17cba9b/69185100571.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/musorefudonab.pdfIn PDF document text
    • http://cissi.it/userfiles/files/76540015036.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135037a73a23---dubaxesuxemamijekomalek.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16147a60fa0ebe---81859643749.pdfIn PDF document text
    • https://sindhuinvestment.com/ckfinder/userfiles/files/vutexufiva.pdfIn PDF document text
    • https://remont-bez-zabot.ru/files/file/56182154635.pdfIn PDF document text
    • https://penzion-pod-rozhlednou.cz/img/file/julipepixaxuzukumo.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/34967850183.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135085820905---jolugevedupalasaregeraw.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/likulisuwexawegeraduzoxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=android+gba+emulatorPDF 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_off0000b566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB566 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD78 15552 bytes
SHA-256: 1194e2e9547a147a298a4ff568770a1ef52ba17c745316d928d0d9f975523c36
font_02_sfnt_off0000f50a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50A 10644 bytes
SHA-256: c0eb5a15836056b4be8c768a5433d1d56a42e13c59ae7752bc63e2735eb61961

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