Malicious PDF — malware analysis report

Static analysis result for SHA-256 37881be41494b208…

MALICIOUS

PDF

68.7 KB Created: 2021-09-19 02:18:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4d6e28685f785e809bb0b3e45593c173 SHA-1: 2092899391010bf20d3eae8f24d2260dd971e88b SHA-256: 37881be41494b2087e1ea6efd08db7a0139fd8ea6e341ec90b7f7623377d8797
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings point towards a malicious document, potentially leveraging embedded JavaScript for further actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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=kotlin+navigation+drawer
    • http://bociany.sk/media/file/rineg.pdf
    • https://dom4m.de/userfiles/files/97602367146.pdf
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/potemipafufesisobe.pdf
    • http://rowerowaszkola.pl/imgturysta/files/wiwirikitexomawelir.pdf
    • https://gencatakan.com/upload/file/93888695687.pdf
    • http://dalboncostruzioni.it/userfiles/files/gerilifibigirif.pdf
    • https://ka-base.no/images_content/file/rotipawabimunidu.pdf
    • https://producedepot.us/userfiles/files/84901372522.pdf
    • http://rajskiewakacje.pl/userfiles/file/31436815573.pdf
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/75264818502.pdf
    • https://seikai.jp/free_images/files/46329402654.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e88e4a7f7---95270248204.pdf
    • http://infinity8talents.com/userfiles/file/webodexuvodavifamivakaf.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7aca3fe72---wotoxagofena.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/9094599eb158092d2b1ac7514c3f35a9/jotumakorumukubid.pdf
    • http://sevennews.com.br/ckfinder/userfiles/files/80110272585.pdf
    • http://rebornfair.com/FileData/ckfinder/files/20210909_F1801CE71DA8F67A.pdf
    • http://autothudo.vn/upload/fck/file/pekefaz.pdf
    • http://tinhdauvietnam.vn/upload/files/8300821056.pdf
    • https://impulsa.mantareys.net/uploads/plantillas/files/fabagajukodaleremejexanus.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ae6c.bin
da74b281b446d2055d33d80e501655946ef45af422b3d805be838c6ea4827bf5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE6C 15812 bytes
font_01_sfnt_off0000d62c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD62C 16792 bytes
font_02_sfnt_off0000ee43.bin
d788f53edfb1a12cadadfa34ba12a222d27d8298c994799e94f730cdd75a01ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE43 10396 bytes

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