Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c97b85253e2564f…

MALICIOUS

PDF

90.8 KB Created: 2021-07-21 00:27:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-22
MD5: 46609dc63b304ea40154974a7c2d3e4f SHA-1: 95538e219973a5950d676d16c0c8d8fb2f9f9834 SHA-256: 0c97b85253e2564f04e15fc8b3626a72c820e8da1b04119d262137a6df0b1b84
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 0.9932

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://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d23dcaea389---91163451012.pdf In PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b14bf3d1269---68014753739.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608308dc5e0ee---vasuxakujijew.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/29200349261.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607775784670e---80791345516.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/oghae5l5qs7uk9gba8d6mf4pbq/81533287871.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/75166535424.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/dovemuvar.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/d14a9a734b768308e613a05e4f9b8f3d/18788014735.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16081c184c1d75---53852120909.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/zuwude.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/de873d9c6c253317b689ee7fbc901376/karekeduzofubo.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/b9ae88922f4429f7e0b23ff41967951d/86503115847.pdfIn PDF document text
    • http://diodelumi.com/ckfinder/userfiles/files/30840584769.pdfIn PDF document text
    • http://www.bluefashion.cz/ckfinder/userfiles/files/bejaxiwunekalosororibi.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/novumurukudeg.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/c137e4b990b7f3a14b1a696e943cdb39/963791959.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/1cdbadd67e80df58ffc2a1ecaa76a7b0/54633457893.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3fdeaa4ec---zobazesisimifofakarime.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/356a4cfd8bc5b0fc1afbbf5c4e20dc4f/todipinibelete.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/zunig.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608416ccdb07b---legasiderigosivuvun.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/22228482214.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=sheep+may+safely+graze+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A5 10780 bytes
SHA-256: a9f9722218f8d4d8e4bfe183849fb55cba7a01bb0f4ffa1791fb1bed8ec292f7
font_01_sfnt_off0000ff4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4D 5784 bytes
SHA-256: 6be4285899bf282801fe191ca3bce3943732798a18122c26f9279bb9f06eeae0
font_02_sfnt_off00011384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11384 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012b96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B96 19264 bytes
SHA-256: 3fc98b688e48ba80300450b562dfce3e0e9be51a88c9aea4bf8948db780fb6fb

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