Malicious PDF — malware analysis report

Static analysis result for SHA-256 848f68ab7cbed422…

MALICIOUS

PDF

87.4 KB Created: 2021-08-19 01:00:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 09f4b8a83666645082473e3bcfc08662 SHA-1: 602fdf57f6227036c354d9946bcdfe6e69180ecc SHA-256: 848f68ab7cbed422d98f0442a8eb9f5b181956572226cf051a085e59d9c831e3
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links pointing to compromised websites, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript points to its use in executing malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://ta-taiwan.com/app/webroot/userfiles/files/17234329912.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/b835f9f1e2cc6e59855eebeb0a5a5048/jisuvukilel.pdf
    • http://aybar-gallery.com/userfiles/files/wigezafubukemujula.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081835b1d7e6---fadapela.pdf
    • http://buyyoutubelikes.com/ci/userfiles/files/47347304759.pdf
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16075a6d39a175---22419518846.pdf
    • https://www.santaterezinha.com.br/js/ckfinder/userfiles/files/15636770194.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/52ff74c21e48f776053850c45f72c7f4/47780807494.pdf
    • http://fedoro.ru/upload/file/62790668705.pdf
    • https://pypconsultores.mx/userfiles/file/52984387108.pdf
    • http://jsdarvin.com/files/lawusuloxuxomizajaloki.pdf
    • https://purevdavaa.mn/uploads/ckfinder/files/tofor.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c61455a58---17370505290.pdf
    • https://wodepcb.cn/uploadfiles/files/tilaxoset.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094d1e3b1d4a---31821623608.pdf
    • http://bizbecho.com/pa/trainstation/uploads/image/file/98851486540.pdf
    • http://clinicaveterinariacittadivignola.com/userfiles/files/85843572183.pdf
    • http://eschool365.in/js/admin/uploadfiles/file/19076078498.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/j1qlvgs8jt6r3s0bs9tn0bs8r4/45182710939.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16091959d9ca3c---pisalonadesezidabilo.pdf
    • https://csp-pub.com/stockages/files/kepujazuwezuduzesowopexa.pdf
    • https://fotinepmuveszeti.hu/kovagoors/uploads/files/migotatadixenimefakawe.pdf
    • https://gotamsui.com/ck_imgs/files/23614542114.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611bb5d2c8d82---joguzumaxegobebuj.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=driver+de+sonido+para+windows+xp
    • 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_off0000f04c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF04C 16792 bytes
font_01_sfnt_off0001085e.bin
146b3b2f6830a72c371a928329ca4b112413bd07de94bab8f045cc0534cfa677
pdf-font-stream PDF embedded font (sfnt) at offset 0x1085E 18032 bytes
font_02_sfnt_off000136d0.bin
abb1b9d835a6ea2410f2e69f532b54d74efd761c27e24917980c6458fcf73fce
pdf-font-stream PDF embedded font (sfnt) at offset 0x136D0 10496 bytes