Malicious PDF — malware analysis report

Static analysis result for SHA-256 68e4398d9edc598d…

MALICIOUS

PDF

84.4 KB Created: 2021-06-25 22:52:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: eb3be9736e4538b0dd4326ffaeb0de0b SHA-1: 9d6245e1c4e4853cddce217282abfbb7f8deda66 SHA-256: 68e4398d9edc598d00b1ad8838be9ca280a4ae28368c4dd14257cf31784c751c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many of which point to compromised WordPress sites, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The sample's structure as a link farm on disposable or compromised hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/jd5md7usfla40p25jluf8cn3k5/kaderakilamo.pdf In PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/2f7e3e15a67ba26d2b7c336a639f60ff/zezobodib.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/binikewuxasimovo.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/46560390548.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160828e45af6c9---kikasuketa.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/lchab1cmqovtdma0ukq956fp0t/92054144658.pdfIn PDF document text
    • https://rockdental.co.uk/wp-content/plugins/super-forms/uploads/php/files/3ccd3663cf86a4fb6c32cb662def6383/68573998317.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/176ddd57c06b44bdf4e2be17d3392b6d/33117744539.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e62245e0e1---30891561714.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/0b9lequaoaqjg7vu1vfb95h08r/weputanosiwizumaxomagu.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/70256d2154991cedb611dd3c8859da92/78554234032.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/77qb49r7dtceods7bind7ks2ko/16988873141.pdfIn PDF document text
    • https://webmenuplus.com/images/file/dadazubaviterenorevuvox.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c563cbd2c58---birawijifiguboviwigogix.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e378ba90fa---refumiguwosavumas.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/6g3uujk582321tn32jlnqlail2/36615954762.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/21381993675.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8723f85e34---tasotoxemopanafokivifep.pdfIn PDF document text
    • http://emmanuelmissionarybaptist.com/clients/74938/File/73883140263.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab41985bf2---61710536968.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/detodivomaxe.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/90dd77c6edc69ca44251a523e855adec/16080694725.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f05c6ee0a---48239341241.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f848f8abc6---xusibagikolewoni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=gallons+to+cubic+inchesPDF 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_off0000e7a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A8 10504 bytes
SHA-256: 0ee56de7ed1d09f4d06e4b660a86eb1d39f8db708d1a63041e008ace2f550dd6
font_01_sfnt_off0000ff8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001179e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1179E 17148 bytes
SHA-256: 67e39c6f515ea9892f3877e205c6f97967878d6f963d5806338bbf053d844e8a