Malicious PDF — malware analysis report

Static analysis result for SHA-256 228d488d4d55287f…

MALICIOUS

PDF

88.2 KB Created: 2021-09-06 20:27:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4c986559d31308aca2e59563a72d5b91 SHA-1: c5c7d9c5292435857fa250e2a6488e671aa1e803 SHA-256: 228d488d4d55287f296f04d93f665fd0aeb82ae0c3e9814b709eec7cf66c6e91
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple domains, many of which appear to be compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirm the document's purpose as a redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://orem.mn/uploads/files/76439928884.pdf In PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088e640cdd27---79340888946.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e9490c881---luwota.pdfIn PDF document text
    • http://muslimofwestbengal.com/mwb/editor_upload/files/55365016937.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/lekamesuwitogolidojatifo.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160982b6e1b080---lozekoxilepetavegufo.pdfIn PDF document text
    • https://patidarpalanpur.com/web/k/main_admin/ckfinder/userfiles/files/27089553216.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/81769341111.pdfIn PDF document text
    • http://mariangelesorrico.com/galeria/files/486598718.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/69275798439.pdfIn PDF document text
    • http://fluellentrees.com/clients/58222/File/gakim.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160df663439368---7933024629.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/37260851620.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/98633580044.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/ce0dc5373971a47c3388e521289349c8/33473334121.pdfIn PDF document text
    • http://gerocuki.hu/user/file/lemigegitodituluxojopiwi.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/mipigi.pdfIn PDF document text
    • https://jecoexports.com/ckfinder/userfiles/files/lakabusi.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/74391855304.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/zibejefipap.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f4dab75f9---pidirajewujojaxuradugosob.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/8097185169.pdfIn PDF document text
    • http://tahyuh.com/uploads/files/202109020102046935.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=aramaic+peshitta+pdfPDF 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_off0000e9ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C4 10596 bytes
SHA-256: a07abb292ce8865d2a5314057b9b200ca42f1340b961e54812d3d08125baee58
font_02_sfnt_off000119fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119FE 21752 bytes
SHA-256: a4225d00648fa03ffb8f00276057b318cf05c79dd68b1fb27b7743eb8bcb5671

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