Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0813f73bc9c8b89…

MALICIOUS

PDF

107.3 KB Created: 2021-06-29 14:43:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e2876a626fc7b5962fd353d5ad7cb2d8 SHA-1: 83a14b2279e0665245046814d717aa21a16570b4 SHA-256: e0813f73bc9c8b89f32d52b02eae7958b136e7b9b3bdf69639c6106cbc27ea86
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics indicate it contains a link farm and a payment redirection lure, suggesting it's designed to trick users into fraudulent transactions or lead them to malicious sites. The presence of multiple external URIs, many hosted on compromised WordPress sites, further supports this. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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 https://smidgel.ru/uplcv?utm_term=chapter+approved+2019+pdf+free PDF link annotation
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ed7a44081---23808026798.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609da0ac8a653---pubogovunojewawuvigakane.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/11771571d4afa18e3a48fbf3cf1dbd72/limajineponimovu.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/06b39eb2a39b927a8c368bbce94e07e0/27653476015.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609d65d35dd29---18602910148.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/3m8mtidbcg4vqv7ekp7l25rtf1/93542343497.pdfIn PDF document text
    • https://area5srl.it/file/tezuzejovikibabo.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/lqdv1tn3gqiofkal1gaa4rb0rt/noxopodegukipima.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160739e0cd92b3.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b942e4b8026---segukufuwizozeniwalebofi.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16082563032583---25921341017.pdfIn PDF document text
    • http://thepdaitruongphat.com/upload/ck/files/20121551538.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/rilitobapugimij.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/fivirifela.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/97iulv11egb0did3jnhvl6q712/35703576139.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/702230be27a10179c3bd446492301374/bidofedez.pdfIn PDF document text
    • http://kath-kiga-bw.de/bilder/berichte/file/54599869608.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609772cea9e21---98707332978.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/zuzesunin.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160835ea16cc64---78899019128.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/e13c702170cb305ce4a627c8dadad612/tiborikegokez.pdfIn PDF document text
    • https://paperland.bg/uploads/file/noxuba.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/56226396939.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797ac520269---78129966172.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/74d015dd8cac4ea5cc46b13e5679098a/80464100425.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_off0001405e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1405E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15875 10744 bytes
SHA-256: 90f8e6b12ac694c3dc457c458e032641c2a9816637033e608f8d3c3965f44b38
font_02_sfnt_off00017166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17166 17096 bytes
SHA-256: ed4443cae651858a34d101509c6a4faf9c07ba26cd3a9352ca71db31338b141d

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