Malicious PDF — malware analysis report

Static analysis result for SHA-256 06c28fc649183846…

MALICIOUS

PDF

82.3 KB Created: 2021-09-12 03:01:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d2f3a1b728c0236e81bae4317f27a956 SHA-1: 543c2b49085e6125faab288bfee9751aa15c1cb5 SHA-256: 06c28fc6491838466f7d8d86f89009d7b0250da3e868e3c9fa531caea8a6db4a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of multiple external URIs, including those pointing to compromised CMS uploads and link farms on disposable hosting, strongly suggests a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://commsoft.nu/demo/ktb/wsmbilder/files/xesodege.pdf In PDF document text
    • http://feriaalainversa.com/uploaded/files/kavuraxitirazuzeruk.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135bb06458be---40848880061.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/28645839138.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/wufepadorukavodiz.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/xozawamabisuvesavulakavut.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131743b52fc2---37147492364.pdfIn PDF document text
    • http://gpshardorawal.com/hemkunt/userfiles/file/76701809793.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/7052686328.pdfIn PDF document text
    • https://kohphanganhotelandtour.com/userfiles/file/bositopegijiz.pdfIn PDF document text
    • http://sgrdinstitutionspandher.org/sgrd/userfiles/file/54440258553.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/79820771194.pdfIn PDF document text
    • https://www.barefoothoa.com/webroot/js/ckfinder/userfiles/files/zubizavefovofokoz.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcf13baf23---16929435624.pdfIn PDF document text
    • http://www.anaja-inter.org/public/file/54680553361.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/dudik.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/48399079f22b2ca97036548b7f547609/sogomizekegibig.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/66973442024.pdfIn PDF document text
    • http://celesteandtorsten.wedding/images/file/55631391580.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/konixiropidasufalitibuv.pdfIn PDF document text
    • https://pnvvr.ro/userfiles/file/nozodurikug.pdfIn PDF document text
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/50201411017.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/dirimuradoximaginid.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/51625305667.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/xebivezazubolilofiwowu.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/efe6d283fa683c6ae6dfcd39537e7e22/mozelowubikanuwipogadora.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=chrome+flags+adblockPDF 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_off0000da30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA30 10892 bytes
SHA-256: 13773ef6ed9485e00821b472933494a7f40a231d2e40780d37995582a6d8b197
font_01_sfnt_off0000f33a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4C 18576 bytes
SHA-256: 727657b45ea780f763d43a22530b9ce5a7c14b46d0f4b3af17ad5f21416f815f

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