Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f6ceb3bb7e8c019…

MALICIOUS

PDF

85.7 KB Created: 2021-06-30 18:49:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: fe45a8a68061f5daedba4eb426aa441d SHA-1: 7edcb3ea4b5c1af03bc79ea1b32360e707151d20 SHA-256: 4f6ceb3bb7e8c0191604fc3c18dccf991d7876f0f7e6e2df8fed877900c8dfcc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many hosted on compromised CMS uploads, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, but the presence of multiple compromised upload links suggests a pattern of leveraging vulnerable web infrastructure for distribution.

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://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/01ab9279ebb4f1ccbc5e117021e13372/tutujekakimepakedukiseru.pdf In PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/495110d636fddb20f626652d5beaa7fd/lakobariruzasemizudaviwi.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/95e81f94ace2920adad7c8edfc3832a9/rimufumidefubomesofobon.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/cs5jmhj47lh3alfddtgan880hb/46221068099.pdfIn PDF document text
    • http://twxcd.com/img-aim/files/92310204122.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/firobinefoseraz.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/fukunomivumomazuvuriw.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/d3de03f5a38bd6dca894eac8e20642fb/marer.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f95ba917c---46647193473.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/76ec7afda4175322cb658963bc5e1b22/zewewobadikutar.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/a2aqcvtj7ru75gl7d6vr3absb0/92755210636.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/73754061706.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fab1404702---vodola.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608037ef56a7a---rawen.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/32cd16dfed745dcc22b7e415eb0ebad8/77135138928.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1dffea255---tuxalu.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160887887ed423---918168706.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/39476724088.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ec99075a4---fafibuz.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/be9472e3d7e6af7d102790c7119549dc/41432457749.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160944aa7c05d7---gexifuwuvovalojofis.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/71463094900.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da5ae17712---60669824095.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/j509lv27k3qihfgb5u4r4e5ok2/reginafutaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=the+pursuit+of+happyness+full+movie+online+freePDF 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_off0000e8d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D3 10864 bytes
SHA-256: 97abb80f924d48515b3554029997f3e6908dff050eb3e9fdc7ca5b7bbec80e44
font_01_sfnt_off000101cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119DF 17560 bytes
SHA-256: 1a10681509aafefa6d46b34785c5cc3bb3914cadbbdfc916133d49d4e4759913