Malicious PDF — malware analysis report

Static analysis result for SHA-256 76bc6b361981eb47…

MALICIOUS

PDF

91.2 KB Created: 2021-07-30 04:48:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 09e7f51897f81af37cad39bab4dd35e4 SHA-1: c6d40a26f4eee6ffb09ea67e2616d7572451d68f SHA-256: 76bc6b361981eb47041d328c2ad3f99dd838e74ff363bad9f12b558cdf170d7b
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also includes numerous external URLs, some pointing to compromised WordPress sites and IP addresses, suggesting an attempt to redirect users to malicious content or download further stages of malware. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://ampletrekking.com/userfiles/file/73137585106.pdf In PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/de6126c9a50980d833271dfb03fafc89/32936009145.pdfIn PDF document text
    • https://dnsbp.com/all4help/fckuserfiles/file/volatezibijiwovefobores.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/69224c324759e9d1a1b175af779ab17f/zexejavuxefixekagum.pdfIn PDF document text
    • http://micruts.org/userfiles/file/46931777504.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160844687675ce---72304372175.pdfIn PDF document text
    • http://dzbnf.com/upload/file///metaz.pdfIn PDF document text
    • http://davisnewfoundlandfamilyreunion.com/clients/60627/File/78965739586.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/bolisoxegenovimolez.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b57f28489c0---kekewoxunopusemuragagove.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160adebb8749f8---87198995307.pdfPDF link annotation
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/59f07adb567ec3564189ea2dc9d5cb2c/49432163642.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/ugibna38ae72p6g6mq1ntbbkvs/5193271195.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/zitesubojef.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/gejowoxetatifimota.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f0080506bc9---wavozuxinatezadub.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/polen.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/6mrg8s119irig0hgrlb4g5l212/dixujolosanoxawonukugumu.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bd2e2a0d94d---85470351292.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/tdpmi20s7sjjrs8c59i8fu9ag6/pifikulizowedofetukepido.pdfIn PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/6398077446.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6eebf1f79a---48722208486.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/615380fe19997118d7ce445d2047c1bc/2057321896.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/62652194f0d0e2651fa6254a8ef1f8d8/62263331380.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/4eb8b39a3ea6e957eba9acd41900e0d6/55904790532.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=multifidus+strengthening+exercises+pdfPDF 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_off000102b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B6 10812 bytes
SHA-256: 61e362377a313799904c700c3c94a9ae1b6747f0b6db6f16745ac0e899c8fd32
font_01_sfnt_off00011b5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B5B 16876 bytes
SHA-256: 52c0018a6ac7e4abe5890c86bad9f6d7c2f1f516fbfcb5a44cebf08e946d8f30
font_02_sfnt_off0001468a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1468A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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