Malicious PDF — malware analysis report

Static analysis result for SHA-256 adce32f42fe7a81b…

MALICIOUS

PDF

94.0 KB Created: 2021-06-26 15:44:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 70edcffb5c5282df6f35bc19ad8cdd28 SHA-1: 8fb808454e1e6aadb6054d4ebb2d5951343cb64d SHA-256: adce32f42fe7a81be4ec110aeddfd712628637a6a5840a200bf8de50eb1b40e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://olterus.com/contents//files/xupotulagi.pdf In PDF document text
    • https://lawyerupsmart.com/tempimg/file/nazosuto.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/68099422797.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/gawifubatulasizokuxejelaf.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/4914135925.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7d2aad40d---mizoxilosedugigugin.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609778e1bd47a---4836034160.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/xijepesesugabuxo.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/69316527414.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/a0kh2nlkvarqlkchajid9lf3n6/temefabeganelaw.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/c26bd0af76e5f21005e87335baa2a926/pewawoposolubafewedolos.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e7c549c20---25560258841.pdfIn PDF document text
    • https://tsafar.ir/basefile/tsafarir/files/65640362519.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/36475b00b2f5fbf7f4659c573484fc7f.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098450617406---rowopubunoti.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/divexigi.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/8b5a60b4215c2c1d84de8deb0a50a6a9/91763127600.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/68ef1a604e7dc5132f2e03cdc329bbf7/28432059670.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbea47eae1---52443098170.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3401e2d24---boxur.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/pasirololumarivexajijajid.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16098beaa8eaeb---11749225132.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=jersey+strong+gymPDF 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_off00010f99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000127ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127AB 17024 bytes
SHA-256: 7dfefc5a9844a529250a2b57a876e08d4febd32db1eb3542cc7d562632a3c5ee
font_02_sfnt_off0001540b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1540B 10256 bytes
SHA-256: 2fc33cf134a37fff018f961877aaa6a3cc5f6bcee109fb9693f506bd38d55f29

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