Malicious PDF — malware analysis report

Static analysis result for SHA-256 93a2ffdb3a511514…

MALICIOUS

PDF

81.8 KB Created: 2021-09-09 06:10:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 26314c26f1b577f8d0e3437445148c0f SHA-1: 7eeaf9cbe7cc474109b29769cbdeaa70b0834526 SHA-256: 93a2ffdb3a511514e53ea4b23db0fea5b3871f32a94fdce5e09434149aa98b3c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites. While no executable scripts were extracted, the presence of numerous links to potentially malicious or phishing content suggests an attempt to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/1q7uo53itj4489c2ocr64rq67g/92514667257.pdf In PDF document text
    • http://studiolegalezullo.eu/userfiles/files/72840808234.pdfIn PDF document text
    • https://arbormaster.net/uploads/files/63513205409.pdfIn PDF document text
    • http://kingkady.com/uploadfile/files/pokozeroda.pdfIn PDF document text
    • https://unitytradecapital.com/ckfinder/userfiles/files/xonalanuvoguz.pdfIn PDF document text
    • http://ageddfjtj.pretty-match.com/upload/files/38037697189.pdfIn PDF document text
    • http://glavis.biz/userfiles/file/64250607443.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/tuvokuk.pdfIn PDF document text
    • http://ipea.kr/userData/board/file/85836331596.pdfIn PDF document text
    • http://rsst77.ru/upload/files/jenaxa.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/f3lqcvsn06vhrplpeqcj4dbhg2/15958508364.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/rii10ccpdbtasp7gvc1a264nru/24186180212.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612eeb346dd69---xifofisuvufib.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/20219786193738.pdfIn PDF document text
    • https://pamukoglu.com/userfiles/file/50253162854.pdfIn PDF document text
    • http://asid.rw/userfiles/file/lekusirarotolexojenut.pdfIn PDF document text
    • https://geniodelweb.com/file/mesani.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/82478146422.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/2v1ngrtef84rp4ao6cu5hts4o0/89855160583.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/kipopofazugu.pdfIn PDF document text
    • http://analhospital.net/file/files/41549074822.pdfIn PDF document text
    • http://newbiesites.com/userfiles/file/31272484762.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/mizave.pdfIn PDF document text
    • http://hwayoung.kr/upfile/files/37348650512.pdfIn PDF document text
    • http://rfinshaat.az/userfiles/file/66177456187.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16134767f3e1cf---4836579726.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=why+is+my+battery+draining+so+fast+on+my+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_off0000d8b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B8 18228 bytes
SHA-256: f4ce8a0b648fd87009ffb2e68c64ae4b218e7135eccc2b705fd5004a57fd1a36
font_01_sfnt_off000107d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE7 11004 bytes
SHA-256: 38bffded1e78379d74da6558f0981c9707f904200a12afc0b8ea2124db335853

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