Malicious PDF — malware analysis report

Static analysis result for SHA-256 c823915e580483c5…

MALICIOUS

PDF

80.5 KB Created: 2021-08-27 16:46:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 431fce010e1ecc75344355f50a7b0c95 SHA-1: 6cd63ed5f79ab8a6a4096d3e17d5e60e4428b768 SHA-256: c823915e580483c52d0add839b957ccff847ee56ee83d6019ff24136dc67c9c5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/c20b74c1bc19b6dc87060f8b6febf234/zexali.pdf In PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c9614d4c9a8---21975727477.pdfIn PDF document text
    • http://beiks.info/public/file/71624174993.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/85349647892.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/587173ae6a5e94474836d1188172d9ec/kevinesefijamoxexude.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/b114b048133fcdef48d57486c22f7524/15799263484.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097dc5994212---68214893553.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/74c10325ffdb33769398a976ea52711e/munavinemumudebebozu.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/55025288559.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ae895896f57---82366889326.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/402076ddbc509deccd1e19ea7ae62444/sidujewasen.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/34776336000.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/47037609067.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/sebob.pdfIn PDF document text
    • https://combrooncom.com/contents/files/mexigetebolakixaxid.pdfIn PDF document text
    • https://palet-school.com/files/files/mujewemigafijo.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/34697860388.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/33783651532.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094255c9d1fe---3848386945.pdfIn PDF document text
    • http://haki.vn/uploads/files/26181132306.pdfIn PDF document text
    • https://emprenderem.cl/files/wamuso.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d28e0810fd---jesalepenuj.pdfIn PDF document text
    • https://rivaflo-south.in/userfiles/files/jepawunilegejusoxesat.pdfIn PDF document text
    • http://megatex-plast.ru/pub/file/50165498903.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/96313150734.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=mind+map+powerpointPDF 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_off0000d72b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3D 17240 bytes
SHA-256: c6d039480fdebeccf17c6fab41ea6042a3f08097352d4457147f03eba42c86d3
font_02_sfnt_off00011c15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C15 10420 bytes
SHA-256: 52445feed574fe4a4d5ec4be36e3036c216657712be15696a13c383b9db7d2f6