Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad3ca08b8bc42b87…

MALICIOUS

PDF

73.3 KB Created: 2021-09-01 03:04:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b75beea51e5182ae1486ccb49df870f0 SHA-1: d1683270c14ab5e411fdf457a3ab0216d9b5cd94 SHA-256: ad3ca08b8bc42b87ba97c4ef861632f7de66f182cf2962d25eb2f08d4e5fbd49
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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
  • 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.
  • 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://williamshudson.org/clients/3/35/35bf74ce48b5c120232fd40fb4fe3e45/File/fonimolasakizokaka.pdf In PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/51655441998.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/387fa87eba6253ffac458561af194607/62376961558.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/76177277712.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/55715483912.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16125ef84dbe50---lejekoxabuzogaruzili.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/32988390226.pdfIn PDF document text
    • http://vip-cond.ru/userfiles/file/47575706309.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/23795258854.pdfIn PDF document text
    • https://terryhaas.com/wp-content/plugins/super-forms/uploads/php/files/fb646ca5245048a365772530e451d5f4/jaxonokebobunofuzeze.pdfIn PDF document text
    • http://glcore.net/ckfinder/userfiles/files/sojirizoxeme.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160de5575e56f4---mesonutimel.pdfIn PDF document text
    • https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/01f861e5d77262ed8c31e20fde857bb3/jujuxoze.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/davave.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/46881780990.pdfIn PDF document text
    • https://susta.vn/userfiles/file/kavidotawuga.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1611afa2373e31---63402520133.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/jujeberilaweveraga.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612caac4ada48---80872496976.pdfIn PDF document text
    • http://ambulatorioveterinariobubiniregini.eu/userfiles/files/falowora.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/37054216610.pdfIn PDF document text
    • http://st-communications.com/ckfinder/userfiles/files/62000214705.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3e6647415---davogupa.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/uqtr7bkdfp0fje8oqmmj3as3rt/zuxodeves.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/59740176533.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=stomach+only+hurts+at+nightPDF 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_off0000c06a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC06A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d87c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87C 14748 bytes
SHA-256: c4ccaff2e4da18b8197cea62069bf08c7b05b3b71c31e9a3608b0daf95413be5
font_02_sfnt_off0000fd9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9F 10832 bytes
SHA-256: 33917488df8f55647df4f5f0e62a20933b2b78d1c8b9019f398b461d7dca0c83