Malicious PDF — malware analysis report

Static analysis result for SHA-256 b311558187c0d00a…

MALICIOUS

PDF

91.9 KB Created: 2021-09-20 17:08:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c41a8910e0f7eed700f2ff3cabefa33b SHA-1: ab4bc4d7b7d98c4a25ccb05d9fa8a6f099f07d18 SHA-256: b311558187c0d00afe7847185048f15d91d909cbcfcdc1f603bf3d2802f2fdf9
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://juditphotography.com/picture/userfiles/file/46288330480.pdf In PDF document text
    • https://corianderedmonton.com/ckfinder/userfiles/files/bizilutavidumeme.pdfIn PDF document text
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/nutoponisomokopizajowow.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/ludularusodudubisilejive.pdfIn PDF document text
    • http://air-ned.com/uploads/files/sidubon.pdfIn PDF document text
    • http://eros-arena.com/eros/userfiles/file/ladofira.pdfIn PDF document text
    • https://ahirealty.in/admin/userfiles/files/21244600437.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f94eac5ee---sefukerawo.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0306622b1---24843233514.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/buzotogapusotuzegeje.pdfIn PDF document text
    • http://www.papelerialapiceros.es/ckfinder/userfiles/files/ludutejesorafogurivu.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/61378392176.pdfIn PDF document text
    • http://essiac.cz/UserFiles/file/72985743052.pdfIn PDF document text
    • https://hgqq.hk/tony/churchofgod/ckfinder/userfiles/files/48947980690.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/rowusigezefinajozibuki.pdfIn PDF document text
    • http://jump360.co/upload/files/20210908044540.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/14021550365.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/d75d7d634c2e40eb8e988742b5f88beb/kimujozerefobabisewas.pdfIn PDF document text
    • https://dadrarad.ro/userfiles/file/99213748720.pdfIn PDF document text
    • http://klenderbio.com/upload/files/podofiluberivi.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148830e5e289---49090439691.pdfIn PDF document text
    • http://osstemcardiotec.com/files/fckeditor/file/1958346712613cdfcc57732.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/92714557825.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=upcoming+battle+royale+games+for+android+2021PDF 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_off0000fe74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001168b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1168B 11516 bytes
SHA-256: 7479f55cec699cc331c1d226450b0ffc656b73dac9fe617fb53452e5403a72ad
font_02_sfnt_off0001317e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1317E 18620 bytes
SHA-256: a33bcc2090f18347fec3a42a8a0efcbf55400c123ba0add8feb5bb7902ce1f91

Open this report in the interactive analyzer, or submit your own file for analysis.