Malicious PDF — malware analysis report

Static analysis result for SHA-256 d32531e4c3a3b98a…

MALICIOUS

PDF

77.7 KB Created: 2021-08-06 17:36:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d8a1b66245b3e566a64ed2159c1926bf SHA-1: 186d06b45844b906940878904fcb4fb3e617d247 SHA-256: d32531e4c3a3b98a31985c355c506e05c8d30ff3094111410066cc09d8e82b9d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports the use of link farms hosted on potentially compromised infrastructure to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9962

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/uplcv?utm_term=jai+jai+narayan+narayan+hari+hari+mp3+dj+download PDF link annotation
    • http://phuquytravel.com/nguyenvanlinh/files/nijexowasudifunageg.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/15053067378.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160845c5e18385---lodogorarijuvodok.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/72299968232.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609793d121de1---5617903269.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160dabd704a186---jokutupo.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/6480318036.pdfIn PDF document text
    • http://askort.pl/Upload/file/nozaxaxebugijonowalove.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/buzanivu.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/c0cf15d2fa85d1e510eed63f9583d960/51479814361.pdfIn PDF document text
    • https://dobski.pl/userfiles/file/18180118201.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/3252414524.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/4fe2dd6bf5d6b5f3618083f23e039312/8037269147.pdfIn PDF document text
    • https://mintowncoffee.net/uploads/images/files/futilekovejojadas.pdfIn PDF document text
    • https://iuoshili.com/upload/users/files/joxawaxogivulugidixikoka.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/7c4fe29b8e9c3131cf3a124281585ee7/65462929676.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/gomularugovasobov.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/gulivupudamolemimatezum.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/gagirilifibo.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5c7fd85d8---51796328569.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/cc5479101abc00ec7ef863f74b836c32/lifomapomuwote.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/77i3gg2td7ma3ntk1thpck4f0b/faxijuwemowogonemaxuxiju.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/dedefewevixegepez.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607e406e48889---ruwesosojudulakavuli.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/tanemisurodi.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/faienhuusa7ur308hf0l4ak6n6/werujinefadejemomapu.pdfIn PDF document text
    • 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_off0000cae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE0 17016 bytes
SHA-256: 551cdd063cf5e1f3484f45b49b9ea8d839247e5444275f11c3a2e6548e857faf
font_01_sfnt_off0000f78b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78B 10752 bytes
SHA-256: 4fd6771be8069e217c97b02975c1916273ec8d3faab67200a9560234772bcfcb
font_02_sfnt_off00010fff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1