Malicious PDF — malware analysis report

Static analysis result for SHA-256 3237e73eb7d8bcb2…

MALICIOUS

PDF

75.7 KB Created: 2021-09-09 00:10:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dbc98cd8435068c87d37908e94466782 SHA-1: 89d59a1274da0a3b89fba80956dd50a90b385125 SHA-256: 3237e73eb7d8bcb21202cc38fbd6883f3a1bcd90f967ee7453bc06fc52641385
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple external URIs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://brandweeramsterdamamstellanden.nl/userfiles/file/xefekojopenatejeporopir.pdf In PDF document text
    • http://straub-online.ch/userfiles/files/27831338394.pdfIn PDF document text
    • https://begili.com/uploads/image/files/27888088917.pdfIn PDF document text
    • http://cz-synergy.cz/data/file/90357423130.pdfIn PDF document text
    • https://tekmaker.com/upload/files/7005813555.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/9182432060.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/76261529037.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/keritariloduvumuv.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/88397785463.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/kulibekiritovatimiwimufi.pdfIn PDF document text
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/87778086311.pdfIn PDF document text
    • http://chineseclothingonline.net/File/12709686215.pdfIn PDF document text
    • http://renknh.com/ckupload/files/37247416812.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613627f8dfd87---35931805771.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131fdd6d58e0---kumifosimenegaju.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/6537483365.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/mipobizawudijivezeza.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/76150518030.pdfIn PDF document text
    • http://alphamarino.kz/images/news/file/81978709318.pdfIn PDF document text
    • https://hkpefa.org/editor_upload/file/dozanalaw.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.excore.hu/ckfinder/userfiles/files/89765148959.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/wetuxolatujenedot.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/f67c44dbc749aadf3c8a9598799070a8/pefofazonewapezepibore.pdfIn PDF document text
    • https://birotex.rs/images/files/jojubij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=free+traffic+estimatorPDF 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_off0000c791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC791 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA3 16548 bytes
SHA-256: 5544c0bd5738925758a54238bda743134a427b1c52f2b1c8744577e6e6d835ae
font_02_sfnt_off00010a5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5D 10324 bytes
SHA-256: 3fa0d3dae37d88d8c24c8c0082fc4f74312ee3d228c394385fa6f2f5fb6309dc

Open this report in the interactive analyzer, or submit your own file for analysis.