Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1b180ef2135684e…

MALICIOUS

PDF

85.7 KB Created: 2021-09-11 11:48:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f07dc21efcf2a0013ad8daa5be825cd4 SHA-1: 7f00bb762de6adb006fdcdef4a4af09b0d777f08 SHA-256: b1b180ef2135684ee76e1e8a7f3f4eec53c4b68c3da782c0abbe82260536402b
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, with many embedded URLs pointing to compromised or disposable hosting domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings supports the conclusion that this document is designed to lure users to external, untrusted sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://crabandclaw.com/uploads/files/sefizumezuwumufuvagi.pdf In PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/v0vs4lrbeuabi27vbvk7bav3fa/78105618040.pdfIn PDF document text
    • https://oazapiekna.com/zdjecia/fck/file/79890127295.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/58595634641.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137808d8e197---62718514452.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/29914619565.pdfIn PDF document text
    • https://sunkamalzemecilik.com/userfiles/file/19162631646.pdfIn PDF document text
    • https://frigosztufi.ro/ckfinder/userfiles/files/99796394921.pdfIn PDF document text
    • http://decoworld.in/dayafter/uploadimages/newsimages/file/fizunudowavimufuluvejubi.pdfIn PDF document text
    • http://spostojow.pl/userfiles/file/roxeruvagovefeneviwe.pdfIn PDF document text
    • https://tonerihned.cz/userfiles/file/4643768100.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/jakusujo.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/nixadamal.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16136ec0dd5782---zesomorejaje.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/39809347224.pdfIn PDF document text
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/99993977464.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/pudibujivupupo.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137ef83856c8---60616246692.pdfIn PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/muredupube.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/93724988839.pdfIn PDF document text
    • http://tns-china.cn/editor_upload_image/file/77669558783.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/rewerewodewilanal.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/mepepoxijetaruti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=android+interview+questions+tutorialspointPDF 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_off0000eb78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB78 10764 bytes
SHA-256: db36dc52d4455f5073246ee9cff55fe5985e87784e78c45b58a30963156e5e69
font_01_sfnt_off00010436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10436 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C48 17264 bytes
SHA-256: 0847a294f68c13ae996e0d5f8b1395bed34252414368480a8f655d66d3314fd9

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