Malicious PDF — malware analysis report

Static analysis result for SHA-256 50ec8b47b4708501…

MALICIOUS

PDF

135.8 KB Created: 2021-08-23 08:43:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8f97c241ffacc553af0997b9358cb83e SHA-1: 9382a524a5640ca1a3b1d98ab8b0b42064e3426c SHA-256: 50ec8b47b470850162ca965958353aff59b83efb1158c75535c9d5bfea124ac5
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 http://sinorarechem.com/upload/files/71420142317.pdf In PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/gc7l9op0lshi7mp60s3s4gdlho/nigaroxijorepeka.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/mcbebetq2gcnh669rl3uei7q9g/67154501581.pdfIn PDF document text
    • http://home-delighted.com/user_img/files/kirirorevejozudimorobela.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1611ea7071aaac---xatul.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc4945d5eb---75088281463.pdfIn PDF document text
    • http://fbchitchcock.org/clients/8/8b/8bdff38a390027835eb24981312b950c/File/vevaximodumone.pdfIn PDF document text
    • http://clinicaveterinariacittadivignola.com/userfiles/files/81395431894.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/sdji6tq64pdu72fpaq6p6rbm32/90043814092.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/5e9d56b5a400274fe379031d33364e41/goxoxaresetikilef.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/290k2fstv4rp55h3pcbq1ikse5/51576463626.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/f5056dc28a696c62ed127c477e8e608b/83072067123.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/lexotunevo.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/92186191627.pdfIn PDF document text
    • http://sunarfactory.com/userfiles/files/38058005666.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160b389ef53241---xobowotagarefepalip.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/596d6b5db88d9888fb277fec6015b966/pegelekemazedapoxupal.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cff5098d5f---resubosizi.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/semor.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d17e69c966---gogug.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/97ah30ort6umjdb9fiuqbrket2/beguzulikinikixavuxumeju.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/duzaditoxepejusefalok.pdfIn PDF document text
    • http://jarosi.hu/files/file/nesepebuju.pdfIn PDF document text
    • http://www.marfag.no/k13/kap-4In PDF document text
    • http://www.marfag.no/k13/@@site-logo/nIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=emergency+care+and+transportation+of+the+sick+and+injured+quizlet+chapter+4PDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/4aec9a6a683586f3e0d7d9a8626bd9bb/mavogotomudugu.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_off0001a824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A824 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001c036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C036 19732 bytes
SHA-256: 45a55762adf2e7951a3b6fb17299e04025f429a94ad3c32193d298ad6ea8421b
font_02_sfnt_off0001f42a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F42A 11772 bytes
SHA-256: f3a3452b6e4343c56eefd516a34f77156bcc36524b9b95740ba8bb47597201c8

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