Malicious PDF — malware analysis report

Static analysis result for SHA-256 54daf3c078761533…

MALICIOUS

PDF

114.7 KB Created: 2021-07-07 02:20:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 705ded241eea4de430a745182c984bde SHA-1: 26d78467ef8c24386482a65ab5c8f76283f69119 SHA-256: 54daf3c078761533a0fda05335479af615f8bd4c977f140e914704601fd990f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to other PDF files hosted on various domains, many of which appear to be disposable or compromised. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the structure suggests a link farm designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://nomylo.ru/uplcv?utm_term=esters+in+food+flavourings PDF link annotation
    • https://ski-experience-japan.com/images/blog//file/benek.pdfIn PDF document text
    • http://balone.net/_upload/file///laderamenarorimev.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609247c2a5fe0---lejukugevakipe.pdfIn PDF document text
    • http://tate79.com/clients/868750/File/97497574530.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/62790282708.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d4c8113f2---84101491348.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c2f3a70b5---86234444233.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f47b17d99c---pafozilofikupa.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/60280937866.pdfIn PDF document text
    • https://circolodelpistone.ch/userfiles/file/50048477656.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/9f99cfa40bd6232075e4498a9e295a27/wutenamovotolelevaropuma.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/akdau05chqb4hl8n8m48oupsrj/54219000313.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/1507467c76e4dfeb0a914b0dd80d37a3/37332943195.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/44717135343.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609508d7009ac---kavaresexomojora.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7edb2075d5---28213447310.pdfIn PDF document text
    • http://flgr.ru/files/files/66625541631.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/tofixavijumizanuf.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5d48825328---18860849538.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/a88aae7b19328e26341f7ed19d5834ef/43607470567.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/14116654777.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/92773115429.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/8588155095.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16095f7efcb571---tegedijudovizupukalotipe.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6510aac21---56741940468.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_off00015c66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C66 18380 bytes
SHA-256: bfe6879f2e9188e606d7672f9ec21fac2707540661630a92fa4d2a104bf19b3a
font_01_sfnt_off00018cea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18CEA 10676 bytes
SHA-256: dc35cb337b855535723ea21b1bbca87dab6aadce673b806f26be18ce248d9d48
font_02_sfnt_off0001a552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A552 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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