Malicious PDF — malware analysis report

Static analysis result for SHA-256 270b2ae06eb9f45e…

MALICIOUS

PDF

97.5 KB Created: 2021-07-23 19:32:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 89d26aeb5329357163fed3a46a348742 SHA-1: c076f2dddfd89bdb4d740d439744e5deb86ae5a8 SHA-256: 270b2ae06eb9f45ecb47481ab4238df054402e98e45c7ad37d5429ed43c2a83e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to potentially malicious content. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The presence of embedded URLs and the link farm structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://cafesca.mx/ckfinder/userfiles/files/40952765575.pdf In PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210611042323.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/57414931394.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/t550h057lp6ubfmkij6es660mv/sorepebep.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/4a29e1b5e62ac2bb7718643c0f42152b/xefilesosujesotexogejibax.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/7105909630.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160832613a205b---80613984413.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2723e41ed---ganuvuxosinasolukupo.pdfIn PDF document text
    • http://slanfusa.org/clients/47225/File/fapidivalebesika.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6c8ec272b---65616271525.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c9bbbcca0---kubibipilonememara.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/18085313946.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/nosanep.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082aa198bee1---75198171255.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2befbbb76---rajuvufasevesuvi.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/94556121466.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/pisufuwafugup.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/qi314s0b8q3pt81mv3f09uk7jn/tesigokelotuwomab.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/86090812566.pdfIn PDF document text
    • https://bczenekar.hu/files/file/veruzupenupusokab.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/84e8d9a9746810f4db59e03f9d161416/muzitarosozidisulu.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/5104999091.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+catch+shiny+magikarpPDF 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_off00011814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11814 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13026 17608 bytes
SHA-256: 8818cc7f756af76afb6116e736ac88562727bf187773dec9f54d4ebd49d3e3f0
font_02_sfnt_off00015e35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E35 10928 bytes
SHA-256: 1c115694c69821024ada465555e7f43571d17593f2e11ca166048a501923f5f1

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