Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6c4e572ffbfff14…

MALICIOUS

PDF

106.8 KB Created: 2021-07-02 13:42:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4e1e48d9f1a583b4b342a83a30a99802 SHA-1: 2ebf54f2530004f68a48d5693ba0fabaf6c119ec SHA-256: d6c4e572ffbfff147132eba416702f5e8371c3fde289ef5ab51a9eefd3bd9c7a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites utilizing the Formcraft plugin. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the structure and URL patterns suggest a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9746

Heuristics 6

  • 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 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.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bddbe24f12b---35197505416.pdf In PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3ecd6cda6---92957677414.pdfIn PDF document text
    • https://familienbilstrup.dk/userfiles/file/fazuzurofib.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/vesuwobowegiwuwimumizita.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe4bb34b8f---luxik.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/pedetepesominoki.pdfIn PDF document text
    • http://nessium.net/userfiles/file/96638512326.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608405c0abb44---dabagef.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d8962fea8---17692307122.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160abaf60e718a---83757282447.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/93840902794.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bb34582e730---jidogarofetozotugo.pdfIn PDF document text
    • http://kelvista.lt/images/files/50459053597.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160987609c3921---94024995213.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cab1f297097---47869436777.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6235907668---tajuvirupoxibusijupup.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/46887707150.pdfIn PDF document text
    • http://clarkhigh72.com/clients/3/34/34275c7d49a174b5f6cf03bf5966da6c/File/52024580023.pdfIn PDF document text
    • https://noddy.nu/images/file/golugonitari.pdfIn PDF document text
    • http://dzbnf.com/upload/file///dixogorif.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609abc3599814---safojajebijupurajodute.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/41239014543.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=to+be+connedPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a980e7a9adf---begoxusukuximoburefukajov.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001021e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021E 9800 bytes
SHA-256: 5434d15b282bf45018e0a29fb382781c53f26328989543cdca83df3a34a8e3d7
font_01_sfnt_off000117ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117AB 20940 bytes
SHA-256: 339fb72562f3f4fb5f77e38300324d722de9a3e06197e6258e54dbda7aaacbdf
font_02_sfnt_off00013bb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000153c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153C3 2968 bytes
SHA-256: 4941affb4c4da2132d734a06f98ce2da572c55771e2e0f83adac99534d8dedab
font_04_sfnt_off00015fdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FDD 24344 bytes
SHA-256: a818fbc1be1571bfe514f8b97e5a8f44479bc74f76e22b4dbfd528d18eba5954

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