Malicious PDF — malware analysis report

Static analysis result for SHA-256 b18223a4eae564b8…

MALICIOUS

PDF

82.8 KB Created: 2021-08-21 08:58:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 699a5734ad9d3a917260e249fba77fe3 SHA-1: e221deec0d88f1a10f56e3a2372e2acc19ea5306 SHA-256: b18223a4eae564b8e31249f160c31ab2314eeb2327b74a178cd58c1807486940
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 0.9917

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://crosswaysrecruitment.com/userfiles/file/vunodupijekanenusow.pdf In PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/gupaverijekadok.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160a60ede3093a---kejufopitinoluturowijat.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/lenugunimitotenip.pdfIn PDF document text
    • http://liyangah.com/Upload/file/tutebukuxegopofetilasulez.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/c1194647585b66e8741cb5ff239c9f68/85562784858.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/80127262371.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dee4b17b75---lamazazevovutotabimuzo.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/vuwegavuzaregukexijanor.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a29ddc72361---sapenas.pdfIn PDF document text
    • https://supermagnum-bg.com/ckfinder/userfiles/files/66426495112.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/buxavefe.pdfIn PDF document text
    • http://dzbnf.com/upload/file///wurulutananoxokesa.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/eeaeb1100998de881ce66fa22ba4f547/50195836561.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/97640031278.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081919e5e1dc---wedikedigujulikoxuwo.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/9b4efd92e91038e853a721a5a4a1323d/61002385196.pdfIn PDF document text
    • http://globalquestconsulting.com/userfiles/files/lukiwitibi.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2944bce99---pisoka.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/83680590886.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16071c58fa2e28---nobupikelotuzegipiko.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/eb1231f18f9c7f147103a1f43f0b585e/94024716661.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acad213e793---lomiteliwa.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/oj5i5he0qm8mpp5vfsrqo9sokl/fojobejelowixiraxirofax.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/48621140402.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16117f59770770---38947984092.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+clear+ram+memory+macPDF 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_off0000dfbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBF 10216 bytes
SHA-256: 2b0eaf309009b3359b934d9bcb572d561b50a28e3607bb1a8574ce1cb962d4d5
font_01_sfnt_off0000f6c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C4 17756 bytes
SHA-256: 1f28753f9cbaeca9d6490eba99ba621e711b4385db30228534fdad7df030fb83
font_02_sfnt_off00012582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12582 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1