Malicious PDF — malware analysis report

Static analysis result for SHA-256 e73be54a748ebb36…

MALICIOUS

PDF

80.4 KB Created: 2021-07-24 12:59:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5fb2b097fce8cf31d701afb93f762a49 SHA-1: b027247677acd6c6fd1db7793d0778f8ba41b242 SHA-256: e73be54a748ebb367f11a159b3e7f20efaf10bb2913ef31266560b6755053466
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress upload directories and other potentially malicious sites, as indicated by multiple heuristics and ClamAV detection. The ML classifier also flagged this PDF as malicious. The primary purpose appears to be directing users to external, potentially harmful content, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9288

Heuristics 6

  • 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.
  • 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.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/8o65l3ukto32k2q0s6sm5fho4b/90101054456.pdf In PDF document text
    • http://asea-admin.com/_userfiles/file/20210503055930.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a574b041dab---79132922075.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c3706c3be1f---gekam.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/2a5fda4032248320e6fbe5cb11b610d4/fisoxekapezorabofewe.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/6b3104c110372c975ba281dfe019c301/92218857604.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/wejezadadeboburorexumed.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ba147c9a713---66395664300.pdfIn PDF document text
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/74tnmelmtect3e196oaeckq8bs/39343077692.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/8657124320.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/44134fb2bd99f478819efe458db917ab/gajedolijolijepox.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/84264359290.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/68741152310.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16094d72bc8200---jiruzosevama.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/89b4038c9eab6c5554030bd0329970c9/20608279553.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/neducmi8gb138kmnbi5kmbcral/porukawutuk.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/pogogidenosomavo.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210703210508.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/b5cc6515bon2o2guf6s8l4bod4/66819751478.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/913e5ea82b8762a1178b75c3dc263f8d/63703249338.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/tirirasilolekojojozu.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/52921123213.pdfIn PDF document text
    • http://ukuleleceilidh.ca/clients/860383/File/mematew.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160ad40b466016---31003749578.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/0a8b9d32a2e4d37e8130f5eea16393ad/dupesaradegavadisubenoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=seafloor+spreading+review+and+reinforce+worksheet+answersPDF link annotation
    • 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_off0000dbd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD0 11216 bytes
SHA-256: 78999f9241346d566c5699574f21dddb62e55183da6e01886e0d1d49e3a5e080
font_01_sfnt_off0000f5d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D9 17120 bytes
SHA-256: 2ac120dc9e0cc1781f36041c6aa8d46a5f012e77ce6a9a26fef8b97e2c065cbb
font_02_sfnt_off000122d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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