Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f3278067aae21e5…

MALICIOUS

PDF

80.7 KB Created: 2021-09-11 09:00:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2124b823fe3bbd60387ebb0969360a8e SHA-1: 87e50669bb92651a72125c9297ff24e38bb6e928 SHA-256: 1f3278067aae21e5c32895d782c94f9910bae8f52ae7ce220f46001c11677864
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

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 for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://idealist.ro/userfiles/file/pizetaki.pdf
    • http://gomientrung.vn/uploads/image/files/53486705362.pdf
    • http://topenglish.sk/app/webroot/gallery/files/56605746511.pdf
    • http://ventmetal.ru/userfiles/files/bopopatorujevezoxus.pdf
    • https://innovaciones-plasticas.com/imagenes_cont/sitio/documentos/nanoden.pdf
    • http://zetrade.cz/userfiles/file/94301402784.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c273f3bb67---rodudukasom.pdf
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/sokafozitug.pdf
    • https://otoform.com/upload/ckfinder/files/88215501331.pdf
    • http://dorrstrechy.cz/UserFiles/File/sifasegakutafivaxubuxenib.pdf
    • http://watdoenwevandaag.nl/upload/65808050449.pdf
    • https://allmassage.net/upload/file/20210910151949.pdf
    • http://bloomx.com/sites/all/sites/bloomx.com/files/demad.pdf
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sosajobelanojamugem.pdf
    • https://www.db-ynox.fr/ckfinder/userfiles/files/73669519565.pdf
    • https://karpzbeldowa.pl/uploads/userfiles/files/gazunag.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/cmu1d9k1fu56gmke8lmdts8vbd/nefevigagogukerefanef.pdf
    • http://zssadkowice.pl/pliki/65461179536.pdf
    • https://gilbertems.com/videos/file/92561256517.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/fc1790db2706c929dd927eebc79d6cc8/fujuzasolosowofo.pdf
    • http://gamjagolla.com/uploads/files/66632871608.pdf
    • https://12shio2.com/contents/files/73336350886.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=the+wow+diary+pdf+free
    • 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_off0000dae9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE9 16792 bytes
font_01_sfnt_off0000f300.bin
75b4ca8149c741ad6b9d1443b1c837d9958d40458e84d211cccbae8acd06b593
pdf-font-stream PDF embedded font (sfnt) at offset 0xF300 10344 bytes
font_02_sfnt_off00010a87.bin
29fff40c1b45bc5b257a10d75bf16116c44f43175d26bb9e873d8e6da019ee6f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A87 16404 bytes