Malicious PDF — malware analysis report

Static analysis result for SHA-256 6eae4930fe295f43…

MALICIOUS

PDF

81.5 KB Created: 2021-09-19 18:58:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b8d8a9b2b512399d8f4060e27762e117 SHA-1: beee449795e80904cfd4c26cc353dda1cb41c98e SHA-256: 6eae4930fe295f434b4854c4e2a73a3218e0908753d000a070ae9ea303b51975
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting. The primary purpose appears to be directing users to external sites, potentially for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://mebelhotel.ru/userfiles/files/patedujozi.pdf In PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/c17bd7646a3a083014f44ecef6782cc3/47277970986.pdfIn PDF document text
    • http://medica-brno.com/files/88617450289.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1cb2b525d---duvigugovenobanup.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210902135954.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/92210420121.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/uib790utq07lnrbl4q8o4i79qf/68831487124.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/sutusel.pdfIn PDF document text
    • https://sapporomn.com/userfiles/files/nulesegajojeg.pdfIn PDF document text
    • https://groupunsur3.com/contents/files/rirusojesifolavojidasiri.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/72411176553.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/19480402429.pdfIn PDF document text
    • https://srilangkapools.com/contents/files/jebox.pdfIn PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/gegupelod.pdfIn PDF document text
    • https://efckrakow.pl/userfiles/file/19107232869.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/rivugivogapomuv.pdfIn PDF document text
    • http://sichera.eu/userfiles/files/xopomutizib.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/fonobujuvo.pdfIn PDF document text
    • http://paneldeconso.com/userfiles/file/2005235383.pdfIn PDF document text
    • http://cuacuonnhanh.vn/Images_upload/files/lonavamuwixaximazom.pdfIn PDF document text
    • https://transdeliveris.lt/userfiles/file/70914022444.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/19903341085.pdfIn PDF document text
    • https://clicksnepal.grnca.org/img/files/files/81283475418.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+remove+sound+from+android+videoPDF 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_off0000d7e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E9 10712 bytes
SHA-256: bdbf3ed9f355d53defdd9dc7a7c8476dad976f4fcca45f48ace580ddbb69eed9
font_01_sfnt_off0000f08f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A1 18048 bytes
SHA-256: c16f7f403ead2088dec52d99d158500629c5d2bdb195bf1476b0ab11c6d7e92c