Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1631ff9c85d9a18…

MALICIOUS

PDF

84.2 KB Created: 2021-08-25 22:13:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 9399642b48485dbb3aab9572419e3658 SHA-1: 05e29073029d314b10bcbf26e74dc7a3060aba82 SHA-256: e1631ff9c85d9a18b16a2ed5ed5606b4806aad9b7f89808599c8527b88615ef4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1287a30128---zotamumewab.pdf In PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/mowemin.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/85566700089.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c69ea1f49b---2515469216.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/duwameli.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/2d804bc50aeba9e1f39f4adee2ec967d/83187717019.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0c5ac93350---dumoruzujiwuren.pdfIn PDF document text
    • http://allasclub.com/campannas/file/kizupep.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/fozewirovozokov.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/21090779118.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/33c79c5d11af5647d03308e96725ff37/piwot.pdfIn PDF document text
    • https://gitedu.in/ckfinder/userfiles/files/25995676705.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a08e8f12f92---69539780498.pdfIn PDF document text
    • https://ka-base.no/images_students/files/goverasatowotur.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160abb51092dee---jedaved.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608308a098154---vosopanisot.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a8c4909bd---xovetoxivejemudaviwoxoto.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/jepilosew.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/62697256845.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/51832383423.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/vejazipojopanagizanabom.pdfIn PDF document text
    • http://htwy.com/upload/file/mudusaxulujideralotipexug.pdfIn PDF document text
    • http://wami.cc/data/files/lebebapodijimol.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/ccc7ad8c3d90f797d69197434d6180a5/3070034312.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/siwin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=beginning+after+the+end+manhwaPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD415 16320 bytes
SHA-256: d8271b1b262933652501b5fa1cc1d1cd06097c34f31a8e7ca9377177248cf9a0
font_01_sfnt_off0000fe36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE36 10604 bytes
SHA-256: 5c9777c8c005c7ab9be4b70f750daee6fdce241dcffe8ebcd26afa8cf0e1bd6c
font_02_sfnt_off0001160f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1160F 4960 bytes
SHA-256: f5e98c019c9352f8bddb283c4c7659ffdcb57d36374149394045cf19357d9a1c
font_03_sfnt_off0001287b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1287B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1