Malicious PDF — malware analysis report

Static analysis result for SHA-256 1894f74d325ea4fc…

MALICIOUS

PDF

91.4 KB Created: 2021-08-10 09:46:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 3b6ed9c01b61dd66bf07e29059a4e465 SHA-1: 6cb1bfac98882d5c27b2d6ef50a6f8e8d6c00048 SHA-256: 1894f74d325ea4fca78cd5ed9876bcc1694db4647ecb2e5c0929223d9352a608
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 0.9985

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 http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/5e8c78d0d9aea929a00359767d3fd71b/57521258629.pdf In PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/zemukebikometesa.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/b1d16be097f1820852cc0e3c097ff99d/lulorojebukasur.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/37837647579.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/mekesuzunuvivevetipepune.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074012b975bf---89729682961.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160bc07e36ab00---88119683822.pdfIn PDF document text
    • http://xn--oy2b9bv81anouola.com/upload/file/202107251454388840.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/fujewivin.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/dobexenowalotima.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/bojagogavagud.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acfddb3eb3b---xobololimavigarisulule.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/0rqh1cai8cki4sd3lvpq6its80/mowufobil.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/18128774296.pdfIn PDF document text
    • http://lhs60to70.com/clients/3/32/32806278e47d7e4d905c37b1d6ebf04a/File/58675575220.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/3bf2b0bd93768115afbfacd9495850f7/gebugegutulunofedajo.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ee72f0db2a0---85703421145.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/zotalotaseko.pdfIn PDF document text
    • http://alkanboya.com/files/file///nabaguvedakomorip.pdfIn PDF document text
    • http://vce34.ru/attachments/file/tubujelebenesomafapovulug.pdfIn PDF document text
    • http://myqself.com/upload/files/lopelafonebisalokimez.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/c7q5gdgfakfjt9pb3hmudr2g7g/luzididi.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/nisodatinasesuritonuzi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=la+la+land+watch+full+movie+onlinePDF 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_off00010136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10136 10684 bytes
SHA-256: b09dd12601933d8d9b5dff005021e9d2f83e987fdd34640ca4d259458b8874c4
font_01_sfnt_off0001197c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1197C 16932 bytes
SHA-256: 97dceea49689b425a99144f34a15055e9e0b49fedb97d1fbb85c28c089aacf26
font_02_sfnt_off00014572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14572 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1