Malicious PDF — malware analysis report

Static analysis result for SHA-256 6234ab8b8aed7e1a…

MALICIOUS

PDF

89.7 KB Created: 2021-07-20 07:51:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6653cab40a0c5cefe74c9828888d4436 SHA-1: ab7827f5b8f8ecc4f157e719f22058835bfe4829 SHA-256: 6234ab8b8aed7e1a01083a358c430b8b4ce159c60a781dc2000af11af22ab34f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file functions as a link farm, directing users to numerous potentially compromised WordPress upload sites and other domains. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves luring users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://weblative.com/wp-content/plugins/super-forms/uploads/php/files/kkd5u4d7quhfli68526pdpeihh/84111837265.pdf In PDF document text
    • https://childconcern.in/trila/userfiles/file/bujizi.pdfIn PDF document text
    • http://mosjob.ru/images/file/41429371397.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/45i30bi17okrvq9e9fmfo52au4/buvawopagapevunududom.pdfIn PDF document text
    • http://dollreunion2020.com/clients/4/43/4392dc7a9e9236654a628da0af121bbb/File/fenewemamegotosiremox.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606e671363977---vipuzadejemu.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/897cbcd779b7c4c9acd1951fb0922215/51254858783.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/misitizorusubide.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/caf2cb136859ed72bb7175ad73152fe0/raloduru.pdfIn PDF document text
    • http://dzbnf.com/upload/file///xexefulunurajufa.pdfIn PDF document text
    • https://petikdaun.com/contents//files/35230049962.pdfIn PDF document text
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160765d4847d6c---91599557562.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/27808565729.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160cbc2f7b2b2e---77256222624.pdfIn PDF document text
    • http://wenxuezj.com/images/File/64510298955.pdfIn PDF document text
    • http://www.centralperdana.com/file/xozutiwi.pdfIn PDF document text
    • https://hirurgija.me//files/zemokizaropewozanufotanod.pdfIn PDF document text
    • http://tilestone-pools.com/i/File/74938345071.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/nudobifagudinof.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/3196f743615b0df39d07a364bd0571e1/nekegakivovuta.pdfIn PDF document text
    • http://gilendor.cz/userfiles/file/621121338.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/tedomepazizus.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/veforu.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c5ac5558b---zudotosunu.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160950da5e0fa5---wosevegirolil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=retroarch+android+apkPDF 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_off0000f759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF759 18896 bytes
SHA-256: 8df7e3b5f40cf10c0a043e385680e3d6999526fb563a5487d192543ebe61c441
font_01_sfnt_off00012831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12831 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14048 10532 bytes
SHA-256: 2f7854d7d2d1231433f5ad195afa770a58a5bdf6295818d7905fc3018dde6276

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