Malicious PDF — malware analysis report

Static analysis result for SHA-256 8df7917f8637b9c1…

MALICIOUS

PDF

85.6 KB Created: 2021-07-13 19:47:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f7968fc0c02ed0e230068018cb74e727 SHA-1: e3cae6f3918d624f86438aadd585d020a177dac4 SHA-256: 8df7917f8637b9c1a369229688649e8017db8e10e89d9b848e7d1b9209f1b826
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The presence of an embedded JavaScript stream and numerous external links, many hosted on compromised WordPress sites, strongly indicates malicious intent. The ClamAV detection and ML classifier further support this, suggesting the PDF is designed to lure users to malicious sites or potentially download further payloads. The specific URL structure with 'windows+10+product+key+free+for+activation' suggests a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://pizzeria-millemiglia.de/app/webroot/img/editor/file/sanuzopebefodakofe.pdf In PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086ef562fef8---75883082512.pdfIn PDF document text
    • http://anadarkogomezfamily.com/clients/7/76/76920377ef4e0cfe2c6e77079a05cbd4/File/nukubewinegugerupit.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/dalepekukavaxap.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b594c74352---95678259340.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eaac9bf306---45778275785.pdfIn PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/33335223505.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/24632382714.pdfIn PDF document text
    • http://longbienco.com/js/ckfinder/userfiles/files/72654963872.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da27be304c---potiwexigitaro.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607797ee37d54---kekekigi.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/69742381344.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/rarezi.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/35132750768.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/ba7c00f83352025b0084128f2c518bae/pozazat.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf3c81d56c---60598508907.pdfIn PDF document text
    • http://africa-emergence2019.com/userfiles/file/zuwisadajevete.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/20388117233.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/60337753938.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160779f5f1e1dd---67608255685.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210529_169E2D36C88FFD76.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/purajezirawunerad.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/ce5cc059691912c7f47e459971dd5b14/pefutiduxilosaruzova.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/b8e03b47b0466aa653eed4ef7d51c173/fipufona.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=windows+10+product+key+free+for+activationPDF 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_off0000eb25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB25 11192 bytes
SHA-256: 280f94e087554471230bcd4db52b3f69932a48d3a8db118f21d9641703d948d4
font_01_sfnt_off0001059f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059F 16712 bytes
SHA-256: 7961a330068bccd421b6010b3ef37bb7001aff65217c3f13cd927c0883e4710e
font_02_sfnt_off00013104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13104 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1