Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4c8cae748cf477d…

MALICIOUS

PDF

86.8 KB Created: 2021-09-03 04:28:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8bb502a7214bcfd562e239910a703fc3 SHA-1: 0a9e40c94ceabc8409f3ee4db4deabeb7bac8f2e SHA-256: b4c8cae748cf477d7f3a70d291ca32aaacec2992259b6c56bdd10bf2cc381cb3
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f542584a3f---xofojevatekamer.pdf In PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/mujebidutakurag.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607186f94d123---wowekemabogotarisoxo.pdfIn PDF document text
    • http://lawrence-spruill.com/clients/42275/File/13227253942.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/5719a3ba8aeae3187534733bf139bbd8/narutituluwenekobip.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/4gnvprhprbb8pvbdr3ds28qpqq/3930175456.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/nawapizavolo.pdfIn PDF document text
    • http://ottuk-e.org/userData/board/file/xepakoze.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/f4e3b8d7fc4183ed89c485486da7e80d/23616000001.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608c96180a951---29202976413.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/sajalo.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/15fc9c5e624b3d668589b79cd517f099/ledewoluvikawuwev.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/13781704317.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/56008756615.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/kaximufagetu.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/51461620730.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/2986679673.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aec808b43b---gudakusese.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9ef394fe2---lewiraviligawokutokofopa.pdfIn PDF document text
    • http://damnoen.com/ckfinder/pho/files/vilenogexobi.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/89rdubrjktfdl5ftji3tahuuqj/79563263087.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/a60d8234a7bd66c416f07b67c2cc4d9d/digolevasubavewefu.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/81093377406.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/51643917826.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=comment+faire+une+coloration+de+gram+pdfPDF 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_off0000e80c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80C 10928 bytes
SHA-256: 75a07bb7c627e2c871638f60fbe45c1852fbc4b68b89b08c6dbb3c9f0b6673d6
font_01_sfnt_off0001011f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011F 20376 bytes
SHA-256: 4766910cac82f8ab12cb6947b88854fba960fa137bcc979c62350263afc16762
font_02_sfnt_off000134d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1