Malicious PDF — malware analysis report

Static analysis result for SHA-256 338a8d428cd3393e…

MALICIOUS

PDF

81.8 KB Created: 2021-09-04 18:10:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ba03f6839bd5ce519b60701705d05ff9 SHA-1: a26fbd90adc6121d3543a68935daffaaf6fd5577 SHA-256: 338a8d428cd3393e58d6f2bc45b3429fe84d7ed88ac91a1cb492652bfcbdea14
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting it's part of a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://oniceh.ru/uplcv?utm_term=500+verbs+in+spanish+pdf PDF link annotation
    • http://aexpress.lv/index/images/up/file/kibag.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/16099fb08b3e08---5688791435.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607caf2560f93---34369751498.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608faac5ed83c---99431392013.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/36441467432.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/9462285654.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/21108883007.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/tokezawapezitunogixonal.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/setederubowejaziletif.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/82363911925.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/be9da18ad48c8dd631c5a8aa20b6f813/detuwigebufogilifiw.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a62a9677dd5---98238983544.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/kiwikonomakapadafewod.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/juzaj.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/ruras.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/e6bc911ae6445e52a85a85b68518ab79/59205757738.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2f1aabaa0---43135190758.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/lujeger.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/5022263815.pdfIn PDF document text
    • http://plafondchauffant.fr//img/user/file/sazogobo.pdfIn PDF document text
    • https://andrejc.si/files/file/58859437910.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/vagita.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/402kcmmifp559odsf23hl98kgj/mibedegorofosetazulo.pdfIn PDF document text
    • http://axwelindia.com/uploads/zuweguti.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD931 10696 bytes
SHA-256: a3b5f6d862b7b1850b397bc1fc93bbf6b954a0c26998be79d76a122b1a014d87
font_01_sfnt_off0000f172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF172 18820 bytes
SHA-256: 955bd2884847975d6b7db2a2fb607eec980f3e3c097ff12492edbc55c5f9e3dc
font_02_sfnt_off0001219d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1219D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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