Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc557006fd348823…

MALICIOUS

PDF

87.6 KB Created: 2021-09-06 15:09:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6630ef8963d5533730027336156c6900 SHA-1: e65058564e314a975b19d01c036a7238ad946052 SHA-256: bc557006fd348823ea5376be8df98dcb165af332d3e60aa72d5a73904796acac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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 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://catamma.ru/uplcv?utm_term=changing+dimensions+perimeter+and+area+worksheet+answers PDF link annotation
    • https://drisraadentalcenter.com/userfiles/file/22276188749.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610533b2d801a---53896505856.pdfIn PDF document text
    • https://ikansambel.com/contents//files/gamavetej.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/zufexedogu.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160faa54a15d91---witokije.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160943d1ac5dd2---xakituvapibap.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec5211b10ca---45400839574.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088331f7541d---vimarevapok.pdfIn PDF document text
    • http://oodow.cn/upload/file/2107260607254419761ibjuoh86003.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/tobelezew.pdfIn PDF document text
    • https://hanahana.vn/media/ftp/file/23608755936.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/d873f53699af1da8f6b5bcf9d5d5f7c8/92424603440.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a75cf6dd16f---bagefepil.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/vubajapopalosurej.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16081ff98cb50a---23750425486.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/badifajimepebovakejup.pdfIn PDF document text
    • https://civilkontroll.hu/uploads/file/sezavimuxisukusaz.pdfIn PDF document text
    • https://zevkotodoseme.com/upload/ckfinder/files/50459541394.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/pafovadidiwinefirunu.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/5158412125.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768d86884cc---89673813058.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/d86936a36260ff8b37640ac15890f7e9/77693312644.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/widibojeribenuvo.pdfIn PDF document text
    • http://draftingfloorplan.com/ckfinder/userfiles/files/12292749545.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_off0000ec55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC55 19392 bytes
SHA-256: 9683d62fe02df55a6dab8e73ef4a4c1976a7fcbd2bbacf7715d12a3e54cb1f88
font_01_sfnt_off00011f3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3D 11004 bytes
SHA-256: a023e2deb29b3c6b5e15f8fde8856d9f5f007d717e0ae5351e05c9ca17268691
font_02_sfnt_off00013888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13888 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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