Malicious PDF — malware analysis report

Static analysis result for SHA-256 810f577f0484a26e…

MALICIOUS

PDF

78.4 KB Created: 2021-09-12 11:24:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3bc712ed62923ab20eb11bafbf455c0a SHA-1: aa8d4c9177e3a83cc72c9c5e87f1cac61a1472c1 SHA-256: 810f577f0484a26e939b05df50973e796286ab68357583aec1b68099aedb97e9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains embedded JavaScript and a significant number of external links, many hosted on compromised or disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm strategy, likely intended to drive traffic to malicious content or phishing pages. The embedded JavaScript, though not fully analyzed due to obfuscation, is a common vector for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://hoangphatdanang.xetnghiemadndanang.com/uploads/image/files/57005065883.pdf In PDF document text
    • http://rapet.hu/files/92855212140.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/70503085196.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/ph9k8tf62c3808bbbscfvcc4a1/97586345408.pdfIn PDF document text
    • http://lex.tj/img/file/pezivijexogupuvuva.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/74294625322.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/t14ek4qutksd42ql1k6kja7683/tesanokipa.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/dipasuj.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/460d6a54140f0cc2825964daf502ac34/47680876848.pdfIn PDF document text
    • http://chinazzjx.com/d/files/moxagubabilotupor.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136929e3680f---gemupakamaravavazopagib.pdfIn PDF document text
    • https://worldmedglobal.com/userfiles/files/55510104466.pdfIn PDF document text
    • https://htijsr.com/userfiles/file/49131302047.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613d35e4efa2f---tajedopagigefizugido.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/ccf65c285448c4f2f26d2d6fcb96faef/75668803270.pdfIn PDF document text
    • http://aluminial.pnh.pt/js/ckfinder/userfiles/files/28376322292.pdfIn PDF document text
    • https://justbuymeds.net/userfiles/file/lukiwen.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/kubuxataj.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/gupigamewebuba.pdfIn PDF document text
    • http://boatmonies.com/uploads/files/35554785285.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/91463935346.pdfIn PDF document text
    • https://xn--72ca1bzcdf9cg5df4n5a8cei.com/userfiles/files/mimigevuxosafafexunisas.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/vikofumok.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/b34b5091aedfbf58e5fb2d31826168f1/81422800954.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/a517d89d51d4dec8d2cfe1135b1a40bc/57274335177.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=plants+vs+zombies+2+mod+apk+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_off0000c867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC867 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE079 19104 bytes
SHA-256: c98a1d73232f905e270c3bd2ea9a5f95d7e5c74e15dc83604ef5e2636c5da9ff
font_02_sfnt_off00011240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11240 11032 bytes
SHA-256: afb413ae7b8a62baf3c29d30bc1eb5ed2b97639ea0aa9524acfcdcfcf262f849

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