Malicious PDF — malware analysis report

Static analysis result for SHA-256 54818fe825c9c14e…

MALICIOUS

PDF

72.0 KB Created: 2021-09-20 22:05:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5e4399a445607b2a5691f290c83f83b5 SHA-1: a7b59ddb4f4512e243d9ac6b721acd75fc342aaf SHA-256: 54818fe825c9c14e2037345b1c4ffbe445bb83510a95f69c3ba7c18fb2246868
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links, including one that impersonates a WhatsApp download link, suggesting a phishing or malware distribution attempt. The presence of numerous URLs pointing to potentially compromised or disposable hosting, combined with a high ML classifier score and ClamAV detection, strongly indicates malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing lure designed to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://drafthe.ru/uplcv?utm_term=download+whatsapp+messenger+app+for+android PDF link annotation
    • https://7mark3t2-7aya.com/contents/files/muruvuxopaguvakeroge.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/81687266707.pdfIn PDF document text
    • https://masukpt1.com/contents/files/jakoxegazajige.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/40649428016.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/xopojijolamuwirefigikel.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/2ab94de915fe3a5b4b5df2f2dd7d4e08/9192230144.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/nokugagedetiguvaluduwa.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/79665416856.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/maliveromunamunuborevo.pdfIn PDF document text
    • http://ceroki.com/image/files/65765618845.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/49170870408.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/26730217182.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136a084dd783---5075122538.pdfIn PDF document text
    • http://bronnicy.inhome360.ru/admin/ckfinder/userfiles/files/59684834539.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/lelinolixijim.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613290bf4a885---pafoti.pdfIn PDF document text
    • http://epmachine.ru/d/files/14018139487.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/rulesozidon.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/23860366318.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/46045153703.pdfIn PDF document text
    • http://baschin-heizung.de/meineBilderAlbertGrundschule/file/fimowigamedukemuvigegid.pdfIn PDF document text
    • https://classykitchen.pl/web/uploads/files/fajixefuxubumife.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/fagefefujasaminusadalix.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_off0000b6df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6DF 11032 bytes
SHA-256: 5b9fa8fc75e1e71a014bbbba92593df09a028ffab86a4479463ceb80e6317d27
font_01_sfnt_off0000d020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD020 16688 bytes
SHA-256: 77be2505b14a0a903bdc62d580c0e5a4b5375e941e4b73d5743f328e4eaffce8
font_02_sfnt_off0000fa7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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