Malicious PDF — malware analysis report

Static analysis result for SHA-256 66dfad73c9e35592…

MALICIOUS

PDF

110.1 KB Created: 2021-07-07 13:01:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e0a153651d9b1c52fd9170963edc31a7 SHA-1: 03adbf4bac318a54325186833c817030af343332 SHA-256: 66dfad73c9e35592eeb5ed9b5a18a725e64295ba4646bd856959171a6a262e66
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous external URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9882

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://ketchas.ru/uplcv?utm_term=chinese+astrology+chart PDF link annotation
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e128780a4f3---75260583418.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ce674dce72b---govolobidu.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/84131656305.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/cef3c7c017367e2e9cc11121428329d2/sofebovugorugoxepaludugi.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/03a61844060261410561eef377441d84/kajesosavapuseb.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/4f911231cad823bafdfb223735eca9b3/tavipavupej.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160787d16223f0---bojodemifagixujajal.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/d51d0a4slvc5fmhjicjsknebbg/porisexefezetowapesikovef.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/rapemozevotij.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/3d02601de1f152b4a7fa916b0cd932d1/80548496398.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/xibokolobakibikajiginuku.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c73554d658c---luwuloromobir.pdfIn PDF document text
    • http://vangphugia.com/userfiles/file/53634898033.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/ce9bb78d4e0d1c6076b3dbf64c0c78d8/5475153957.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b40b7e853e9---10271023523.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8f173132a---jekufitavakemukola.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609591afab32f---nedugapeliwatepi.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/7ff9244c50f10d1c8ac7ca734bd4e151/5511674793.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609dfae1df7ef---zovevokavok.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607275e993dd8---45592309426.pdfIn PDF document text
    • http://pneusmarene.it/images/file/81430204386.pdfIn PDF document text
    • https://rumputhijau.com/contents//files/vevagelelojaf.pdfIn PDF document text
    • https://yodobashi-church.com/45286361310.pdfIn PDF document text
    • 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_off00013a91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A91 4656 bytes
SHA-256: 3af3d0cbae05ef23928b75b27366148f2eb8325ef17c0687054638ce9f82a4ce
font_01_sfnt_off00014bec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000163fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163FE 17488 bytes
SHA-256: 49b101d9c70aed9f73bd95a2ec9f87351e008b53184ba62ac6da8ed16f283e49
font_03_sfnt_off00019230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19230 10656 bytes
SHA-256: f4789c8ca4eaf84283ee0a0c128a03594a424c41f1d7936fd317d408ff72e169

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