Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc639db8573693b0…

MALICIOUS

PDF

85.1 KB Created: 2021-09-14 13:12:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e0cc6c5727caa9bef92d636795b8076c SHA-1: c5093510eee49bc1631ea9d6dfb76614a9b85ecd SHA-256: fc639db8573693b04cb50462d94bf50f0f368b188d2dec162e3faaf22cba4a4c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. Several heuristics indicate the PDF is part of a link farm, pointing to numerous external domains, some of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing or malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://searchkar.com/ci/userfiles/files/mivupakulezu.pdf In PDF document text
    • http://abwpetersburg.com/uploads/files/42983853777.pdfIn PDF document text
    • http://ssss-sangam.com/userfiles/file/pabasawenolisegoganijeda.pdfIn PDF document text
    • http://vectorma.ru/uploads/assets/file/zevuzezew.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/vijefizewadalutonumos.pdfIn PDF document text
    • http://fantacyhandicraft.com/userfiles/file/nilegetezogigejujelaxo.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/61828403938.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/6898658768.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/24166578044.pdfIn PDF document text
    • https://atiksigorta.com/files/57373550350.pdfIn PDF document text
    • http://www.facyt.com.ar/ckfinder/userfiles/files/71498954571.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/94482237197.pdfIn PDF document text
    • http://exosushi.com/uploads/files/pimotinewexadir.pdfIn PDF document text
    • http://skupka23.ru/upload/m/jalaxatuxozevurox.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/zifewegubi.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/pafitelomelupotabetowu.pdfIn PDF document text
    • http://s13cf5ef.alojamientovirtual.com/ropadefutbolbarata/userfiles/file/74054884465.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613993f01fbaf---zararuvonosizugotapapol.pdfIn PDF document text
    • http://elitsatodorova.com/uploadfiles/file/70498104692.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/a62cq6bdc19qr34a93phpqm36r/35866679105.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/biwoziwe.pdfIn PDF document text
    • http://mestan.by/images/file/wovix.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-6/20210906033500438720.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/1691e9ff9fce8aab1e22c9442c3c60ca/37564637128.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/kawazazowikogarafunubizor.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/gorukole.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=convert+pdf+to+excel+without+losing+formatting+freePDF 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_off0000e4d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE9 11452 bytes
SHA-256: b289ba04d070390371cb3d2a717cdcb5a6475836b21b01dba7488537f23602e7
font_02_sfnt_off000117a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A9 18116 bytes
SHA-256: e58260acc0f70f5ba12ca453a8e5013415fd8967f9a727cc129e3ba4747364aa

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