Malicious PDF — malware analysis report

Static analysis result for SHA-256 919c9b804507d9bd…

MALICIOUS

PDF

127.8 KB Created: 2021-07-02 16:41:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9f2300ada436132cedccaadf378ae108 SHA-1: 3159e6dd99664afd88a65c4c41a72623bdac2ba3 SHA-256: 919c9b804507d9bd39f9bc92de90a8e92187d15ab7e6739cd950d067249aabe6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a phishing trojan by ClamAV and flagged by an ML classifier. It contains a link farm with numerous URLs pointing to various websites, many of which are hosted on compromised CMS uploads or disposable hosting. The primary purpose appears to be redirecting users to potentially malicious sites, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9878

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://acgroupenterprise.com/userfiles/file/61578580727.pdf In PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b1fc42b712c---tijurupekopebarogonotibal.pdfIn PDF document text
    • http://khanaphatgroup.com/UserFiles/file/4269888810.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/guzor.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/3528052653.pdfIn PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/rabipawojukasuro.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/23156126629.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608740403635f---70152602108.pdfIn PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/57529999488.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/duwibuniwaxigakupakew.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab2cc76782---sabojadesuvapusus.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/4f3e58547cebc803c2870b56657e99be/45137232372.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/b8dcdcbe95682c8c1bb20163b524b02f/53146305633.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/gitatazoxitulezosabikipiv.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a623173f7df---fujuwejer.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/noxomutezutabexuwela.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160843527ba761---metileloxutezoxojefe.pdfIn PDF document text
    • http://dgjst.com/upfile/file/vasilarajopekixejodabozix.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/c085896f4422c848599dec30a5afa612/nutigijib.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210601_020004.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/d255dcf993cb04ed351b5237a9359113/nosixozepatukuxafaxodanu.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/lcj00r49f540ieuon3oo3ugkeu/rudiwukaruku.pdfIn PDF document text
    • http://inezorviskids.com/clients/37546/File/ladode.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/bc8fab9175c615997c4c4c2a07d6e091/fizabakidevifigurezasilu.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160aa548896b72---fezevosotezigetasarizo.pdfIn PDF document text
    • https://discovercefalu.it/_data/images/file/gopitunurarit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=ing+form+as+subjectPDF 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_off00019061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19061 10860 bytes
SHA-256: 9f3f463bd509856df2afcf51200c91d0485f3d1570819f1edd13489d4a96e254
font_01_sfnt_off0001a98a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A98A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001c19c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C19C 18180 bytes
SHA-256: dd3f9c0c3a6eb62cbbaa09c02513d1b17b971b109d17f65e5cb0bf85845bd89b