Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f9b3610504bc199…

MALICIOUS

PDF

94.4 KB Created: 2021-08-19 07:32:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 484365109ee77d0d12466a317caa8baf SHA-1: e32c13bbe3a9aa309c7ffa6ba8c5802de7a7a4d1 SHA-256: 0f9b3610504bc19998acf3fc4d9871e13ae8d911a34f947e40ba29da8cf841f6
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • 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://drafthe.ru/uplcv?utm_term=charges+and+coulomb%27s+law+worksheet+answers PDF link annotation
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/3360132219.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/9bf9a90c2dbf26a7098aa42a3dda8f38/21031449885.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090cba0dcdf5---68248173017.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a917f20dc7---metemosagidavigov.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/sabuwojag.pdfIn PDF document text
    • http://bosch-elektronarzedzia.pl/catalog/file/woluseper.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084746f4381b---76347737326.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f376c36461c---sukiwoberepumexivudod.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/53456eb569281c9e1e02326c714d69d6/madazukixawu.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/jb3kohsm1al171pmdam7mgikks/sapenawolew.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/foxadozufimodonipenolodov.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/2s3o3ec4hf3hkl7et30ct8ra0t/17205801858.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/79195840849.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/08b7e067bd031452e3d066619b0ec4dc/33151072484.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/18130812683.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160758e6009d87---62713225915.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/86166f0e7011616fd745a466cb2ce8f4/gatanig.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/a0e08d334e2e9d791d068bcb8a10ceb2/83694476234.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/187fa147a26fbf6399c436d800f2b179/somobasiwato.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160caeffbb286c---zamefufemawo.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16114996d6f009---48556860957.pdfIn PDF document text
    • https://hissekurban.com/resimler/files/39926684625.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d442d38319---dowokos.pdfIn PDF document text
    • 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_off00010895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10895 18412 bytes
SHA-256: 64d1608093cfdaeef77fb0e9eaf86a711e541108cb957aa7b4b8061e2f758af9
font_01_sfnt_off000138da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000150f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150F1 11208 bytes
SHA-256: 3e606ede0881dd5dae5dfde2936f6b70264b4f69da8eb2189ceec099402fbc3c

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