Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7d7497380304b41…

MALICIOUS

PDF

71.1 KB Created: 2021-09-08 18:05:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0d98c985147abb9e337db01b09afe054 SHA-1: 4f0798ee89eee619b232aa08e77058503d1bba11 SHA-256: c7d7497380304b4144f506394762d79895d684e6dda714ce87496a9e041b8c81
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to obscure malicious links through a large number of redirects. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

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 https://crysiq.ru/uplcv?utm_term=ectopic+ureter+dog+pdf PDF link annotation
    • http://imhkayseri.com/resimler/files/13633808634.pdfIn PDF document text
    • https://ontogepszerviz.hu/editor_up/fivupijebusapuz.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161331d60a3c0e---26826984353.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/86100438292.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/89972855738.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/bogipipoxevadumilin.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/3183720355.pdfIn PDF document text
    • http://trufeel.com/ckeditor/ckfinder/uploadfile/files/39289363429.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130b198bb938---pufawitotunubevapipe.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16134c5481e07a---rakalovosimusasu.pdfIn PDF document text
    • http://aallergy.netlovestories.com/upload/files/gugitodinijejojaxovix.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/53877567535.pdfIn PDF document text
    • https://festival-bg.com/media/ckuploads/files/kepejozutikubejosawog.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/rufujinoputezijibi.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/78879983556.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/25110397936.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/55640345576.pdfIn PDF document text
    • https://ppkh.net/userfiles/file/voguf.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-2/20210902222114803564.pdfIn PDF document text
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/74211259201.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/54081829067.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e858cd539---3298902439.pdfIn PDF document text
    • https://ancoraeducacion.com/images/vunej.pdfIn PDF document text
    • http://e-district.org/userfiles/file/22212575956.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_off0000b8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E0 10400 bytes
SHA-256: ba08cc1bcca54a75e396a73e14b7ac8108474930d5e270f7b7f8c84debcfd71d
font_02_sfnt_off0000e84b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84B 15392 bytes
SHA-256: 0fb2bfb62fdf90c07bf98bf59b112b299b997b14f4c87fff04dde7958ac696c0