Malicious PDF — malware analysis report

Static analysis result for SHA-256 edd259416ead9940…

MALICIOUS

PDF

83.7 KB Created: 2021-06-30 09:42:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 0f43350f98e7821d5da3c3d5e2f0001b SHA-1: 23122cda9d3fbc64afc6324ce5b29bfd948f9f42 SHA-256: edd259416ead9940b12a5371c8fa23d76a069f0aebfd0eb524b92108d968d4cb
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous heuristics indicate the document functions as a link farm, directing users to various websites, some of which are hosted on compromised CMS platforms or disposable domains. The embedded URLs suggest an attempt to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b339e71be8d---96736144532.pdf In PDF document text
    • http://fsanaq.com/upload/file/210618062454392627dvb8crkfszrw.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/37977589426.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/8e97ac0a600b9f2b51ceb8ec33d03fe6/85152678187.pdfIn PDF document text
    • http://endemic-capital.ru/uploads/files/73194905481.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073393a09b77---99513968113.pdfIn PDF document text
    • http://www.irrv.org/uploads/files/pawabepakonavelijomojop.pdfIn PDF document text
    • http://dvarenda.ru/upload/file/levuwevelav.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/5fe9bcf5271eafda3895567697dfea0c/60768641593.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/gefulinub.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/53411476492.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc9feb599e---40191543766.pdfPDF link annotation
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ce8f9ac01---74868106955.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/mizurefatelorajotuvo.pdfIn PDF document text
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8d687b661---wuboma.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ff8e833c6---50131444830.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d0b24cdd0a2---93891835904.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/a09d2de127eb050863d7984daa95d3c4/gogudomeg.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d0705cfcf---33830482851.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/100cb698dd7b8277eb5876a445288761/43794687805.pdfIn PDF document text
    • http://akwarella.pl/user_uploads/file/kosifosapotadolivefize.pdfIn PDF document text
    • https://airflow-skateboards.com/userfiles/files/zumebipomizujobul.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/71330708345.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/totobaxunok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=where+can+you+see+message+requests+on+messengerPDF 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_off0000e34b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34B 16752 bytes
SHA-256: 44cea68f53493c6c25117f74d418f56a0e66414031b4dbd7c4dbcaf816570637
font_01_sfnt_off00010e71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E71 10892 bytes
SHA-256: d04211c4da50e2addb29b480c8099b00c301b3a4204cc469e532e088436b6f9a
font_02_sfnt_off00012745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12745 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1