Malicious PDF — malware analysis report

Static analysis result for SHA-256 432d48827b847565…

MALICIOUS

PDF

71.5 KB Created: 2021-09-03 01:04:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 187a5da0954f0774f0fc9b921f6480d8 SHA-1: 2c6f47abb16991dd826f603302e3cabe6017f982 SHA-256: 432d48827b847565154be4520e0e50bc05d92d410acaf74b7778285e8e1eb736
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards the file acting as a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://allytemp.ru/uplcv?utm_term=yle+tests+movers+pdf PDF link annotation
    • https://jphotographyllc.com/userfiles/file/95626275091.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/8c44eae81fcb92aa72f818a81bff293f/wakasino.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/869b2e4dab96f01b981c5ae601c5803a/2170687332.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a3caad77a71---zomabuxakobezigififo.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/5fcdae4fafeee07498a693c97efd2fcd/87648590105.pdfIn PDF document text
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/wokanenenajesapozezo.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/e2da789c43d33b898a173c5b4f71120d/16312286276.pdfIn PDF document text
    • http://bjqyms.com/filespath/files/20210821055100.pdfIn PDF document text
    • https://ecoquimica.cl/dinamicos/uploads/file/sibupedafasosuwomolox.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e99c52ab6f---43418583425.pdfIn PDF document text
    • http://webursitet.org/Files/file/84484260807.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/a04882851a2478ec697542e27dd3be84/gufuruwalox.pdfIn PDF document text
    • http://mueblesdepladur.es/1/userfiles/file/10390783422.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210504191526820.pdfIn PDF document text
    • http://glina-master.ru/admin/ckfinder/userfiles/files/fikam.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/kumegemupotoxane.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e81b08592f---nuwufexineduzojeselini.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210815204628_2078697876.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/33181216518.pdfIn PDF document text
    • http://atallmed.com/userfiles/files/74139228838.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/tomovoj.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/39241946069.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160730c031eb9b---59148618707.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_off0000b87f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB87F 10352 bytes
SHA-256: 6e1060390ef0a9083bc27c739f3574c60316cd3222fd778cd35a10316376209d
font_01_sfnt_off0000cfe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE7 15884 bytes
SHA-256: d67449de4cb44d1f906037573c913792bc127ff6abc76fe0c0b4189d100dac30
font_02_sfnt_off0000f8d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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