Malicious PDF — malware analysis report

Static analysis result for SHA-256 87f337cc79f38232…

MALICIOUS

PDF

70.7 KB Created: 2021-09-25 23:46:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: de5eb7d5d29384a9717ac367ed5f4dd2 SHA-1: 1dde0296f3f1b2e05bd5a8dffeb1252272211568 SHA-256: 87f337cc79f382329cff591cedcde4e3860cdd528df69565b49df92f8182ea8e
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads. The presence of numerous unknown URLs suggests an attempt to distribute or host malicious content.

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 http://kingtonkatsu.com/uploads/files/pijusalezituxo.pdf In PDF document text
    • https://ctapigroup3.com/contents/files/loxusogu.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/40467448255.pdfIn PDF document text
    • https://comptables-publics.fr/userfiles/file/79189463854.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/nuforakobakimejojad.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613df65b959e1---pefujirowo.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/64860339322.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130f2d60d889---fumupizajuzesuguwuzuvexuk.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/68497285598.pdfIn PDF document text
    • https://olivermilk.vn/tctt/sites/aaa/file/tomog.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/pozebolitojeketamival.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/161446773141fb---mujuxiriviwone.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/vasebanawex.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/ximujixajakewawiduvumebul.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/lotukozive.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/nulanigukeligevef.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/mukobilipadedinokowaxukun.pdfIn PDF document text
    • https://yuktogel.com/contents/files/piputera.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1631358178.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/40139062233.pdfIn PDF document text
    • https://khmernative-rice.com/userfiles/file/83352426350.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/96936201931.pdfIn PDF document text
    • https://momentous-inst.com/uploads/image/files/68280368053.pdfIn PDF document text
    • https://st-stephens-church.com/upload/File/46719898204.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=hack+of+clash+of+clans+unlimited+gemsPDF 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_off0000b322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB322 15960 bytes
SHA-256: ac7d974184e47fb1bf4892b342f6acc565ae63011327f94c437495a6e4bcb627
font_01_sfnt_off0000db83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB83 11004 bytes
SHA-256: 04f5c5b585847544f4700afe4a3c940ab4319e19c77f19fbfa831248576d31d4
font_02_sfnt_off0000f4b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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