Malicious PDF — malware analysis report

Static analysis result for SHA-256 742df57df9b1ad72…

MALICIOUS

PDF

174.5 KB Created: 2021-07-02 09:53:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: f4b6c140d22224fb511541e708cc3472 SHA-1: fa1861782dcca6859ff0a99e1a06cbba4783df60 SHA-256: 742df57df9b1ad7213f7153f341b291d5710a9d2825ad620f0d46f68f4bc8997
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the heuristic firings point to a pattern of using compromised CMS uploads for hosting malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9103

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/quu6oedimlabqtp8d3rrf3jskb/42827389200.pdf In PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160925682a4e5f---99870748608.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/jb2c0ss0pf15sftana4rn7rpl3/sajefefiwinitiz.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/tulox.pdfIn PDF document text
    • http://nova-auto.com/upload/gufabutaj.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/39456365221.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160801e908dd19---71611912870.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/46b98c895fce4bac5b61bea0d92e11cf/sipolozavijatat.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/bc505992fe9175a8d0d7e9a79e3fee90/17624623197.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160be429581808---vidubap.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609824dd55dec---wixivib.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d01b5924b30---vexiloganemapawid.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/85804112800.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160baa99444493---13530429789.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081cf1166c48---pekowojexag.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/jc6luv27tf1gm3696d79oqnoo2/69393327193.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa66f75c3c8---judumidatesewilipo.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ca9aeb480---14411431529.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/32522958039.pdfIn PDF document text
    • http://alphaconsultinggroup.us/vpw/images/file/dovitajoxu.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/f1ef2ced4c6ca44a0b57c2834ec766a4/pabesexemezadepovibujetow.pdfIn PDF document text
    • http://vanxuantravel.com/upload/files/lemodemud.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a704e67ea00---liboxapepifowu.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16081722474df5---83706034243.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/4557979084.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/jexafop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=insect+phobia+namePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000230d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x230D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000248e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x248E6 19892 bytes
SHA-256: 636e3d149bcc91dab61d7bcff58c39e3a41026f1f69e4feb06f6b23b26266453
font_02_sfnt_off00027d4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27D4E 10584 bytes
SHA-256: f300588ac9149d59572c210506fa52525db3e8c18a85f607854de36eef602ca0
font_03_sfnt_off00029506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29506 16096 bytes
SHA-256: afac2f70e72736b4b18f7fc53bd43b7003cb1dc7c077d016d36afb74b1042de4