Malicious PDF — malware analysis report

Static analysis result for SHA-256 940732d6ec04bf3c…

MALICIOUS

PDF

75.3 KB Created: 2021-09-05 10:15:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: fa838f96540d626296aa7fee6fa2bbd1 SHA-1: 718bf0edc2c8ec5c63981fa23fc97db9cecc386f SHA-256: 940732d6ec04bf3c0bd60be7be5a1b65f8d4c87b6efb4413eb27de586a1e9581
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS upload storage or disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded links are consistent with a spearphishing attachment used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://studio70.eu/userfiles/files/rabudijituwiju.pdf In PDF document text
    • http://tubietelbar.hu/uploadfile/pawomariwamujaw.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/giwepovisunadize.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/bapixananusezidugonegejos.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcd124c88ac---46899820366.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d2ffda631c1---fubepubizevuvum.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/62436213587.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/70171669901.pdfIn PDF document text
    • https://mandarinusa.com/userfiles/file/1630313348.pdfIn PDF document text
    • http://nofatrans-int.com/userfiles/file/muminobafupet.pdfIn PDF document text
    • http://ilsungwarehouse.com/userData/ebizro_board/file/96015430806.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16078c8fa23a86---10025865750.pdfIn PDF document text
    • http://blackshirts1960.com/clients/876325/File/lukipu.pdfIn PDF document text
    • http://beulahcooleycollection.com/clients/870349/File/rijinomewari.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/38075612389.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8f3904cbd0---19753170706.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/5188924542.pdfIn PDF document text
    • https://actorconseil.com/files/file/mokid.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/04f7ad9ee67147923f7de76ccc7b687b/xiterolokuruxegu.pdfIn PDF document text
    • http://bifruit.mk/ckfinder/userfiles/files/46668001140.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/52576a849a64511ad678fb23d673d681/vubizamivarobalevu.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/50255497015.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/xuvak.pdfIn PDF document text
    • http://qcfloor.com/userfiles/file/berikak.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/lupikexipararogowunopawi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=dos+and+don%27ts+in+thailand+pdfPDF 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_off0000c3ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3AC 17300 bytes
SHA-256: efc1e3da4d00946e89fd4ecedd7772edd1e359756e6d93ffffe75d22effb86b4
font_01_sfnt_off0000f012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF012 10396 bytes
SHA-256: 86f43d839271ac8cd9929a2aadebd7e69706f81335c8b8938cd95eb415c28871
font_02_sfnt_off0001077d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1