Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a8351e98682bb6f…

MALICIOUS

PDF

94.8 KB Created: 2021-09-16 22:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 6416f5e369aa24f407550df8dc11aa97 SHA-1: 5575beaa043dfecdb0a6db3dac2c9dcd4b3a635d SHA-256: 5a8351e98682bb6f1a5aedbc9a6008bef6791877527f0be044b3cd3df6569a5c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection 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 0.9600

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://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613387869b414---wimemixobeb.pdf In PDF document text
    • https://travelone.ae/userfiles/files/37777240857.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/45282175104.pdfIn PDF document text
    • http://romanasulcikova.cz/userfiles/85066804023.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/vumadanobizeko.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/juxenigutudokumemejuperip.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/41944480269.pdfIn PDF document text
    • http://laserbeautymachine.net/d/files/kudepitagenek.pdfIn PDF document text
    • https://dptech.vn/uploads/files/tizumabonelod.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/88145864452.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613069752c40b---zibalubewigusafowarax.pdfIn PDF document text
    • http://proart.by/media/file/refivuranedij.pdfIn PDF document text
    • http://thaicockstar.com/ckfinder/userfiles/files/37408885379.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/durixesajevidelasidoboruw.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/55ef467c66dcfa03d3b4b64f11c6e880/51763505562.pdfIn PDF document text
    • https://barrier.exma.cl/ckfinder/userfiles/files/78147702824.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161353b9cc396d---36418766536.pdfIn PDF document text
    • http://princeverma.in/uploads/files/tadopagekabojar.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/nemipibezojimupademebu.pdfIn PDF document text
    • http://interstyle.org/content/xuploadimages/file/govabutosirirosubizal.pdfIn PDF document text
    • https://luminex.pl/upload/file/83864835321.pdfIn PDF document text
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/dawidixisute.pdfIn PDF document text
    • http://ediliziaunoaventi.com/userfiles/files/82438400797.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/1170721334.pdfIn PDF document text
    • http://maidichike.com/upload/files/konekobinabe.pdfIn PDF document text
    • https://gym-rectif.fr/ckfinder/userfiles/files/jujujuwis.pdfIn PDF document text
    • https://strategieb2b.ca/userfiles/file/82925022669.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=dream+league+soccer+2020+download+ios+downloadPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000deed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEED 11044 bytes
SHA-256: e50739d9685867533544a77bcd18438a1c98fdfcdecc61945bd9929cdd9a540a
font_01_sfnt_off0000f882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF882 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11094 23772 bytes
SHA-256: 256dc707daf08ff5e0dd4c1d51d635e1758c3eff491faa5c85695ae6331cac37
font_03_sfnt_off00014d02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D02 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_04_sfnt_off000154f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154F9 16492 bytes
SHA-256: db38e5cfbd5807ffcd7fe649ff9b11986c19fcfba6fa4c247f8a063ee878f933

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