Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2e98af689ba93ce…

MALICIOUS

PDF

81.3 KB Created: 2021-09-11 11:25:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 987b47de8e4716823be5e7b03656619c SHA-1: 988d6220e40d3ca128c42135719292cad4d9af6f SHA-256: c2e98af689ba93ce9838f08d32f4c814952d113341ef2b90e7d2b42dd82396ed
176 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. Several heuristics point to the document acting as a link farm, with multiple URLs pointing to potentially compromised CMS upload directories or disposable hosting. One URL specifically uses an IP address, increasing suspicion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://sujitonweb.com/userfiles/files/lewabetusaje.pdf In PDF document text
    • http://fsoa.cn/userfiles/file/vulopimujut.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/60312771238.pdfIn PDF document text
    • https://mimpishiodua.com/contents/files/75507577060.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/kunaxejapaberigob.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/77942687460.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/29803462222.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/faxatuvirudefenipitigavi.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613238af72373---xeligaworamom.pdfIn PDF document text
    • https://taiwan-tiaya.com/upload/tiaya_official/files/wesulapobujumisu.pdfIn PDF document text
    • https://fond.ru/userfiles/file/begomo.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161353aeca76e9---84672701438.pdfIn PDF document text
    • http://kingdom.vn/userfiles/file/movososefafofelosafu.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/zatimemefatuweronifi.pdfIn PDF document text
    • http://vlajkylevne.cz/UserFiles/File/foduki.pdfIn PDF document text
    • http://thebankcardservice.com/uploads/files/7286394043.pdfIn PDF document text
    • http://duhochoangthanh.com/upload/files/99633149332.pdfIn PDF document text
    • http://titusauto.hu/kepek/file/37435124552.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/biadhj89hlg5sj62q7ccuja75l/44306719236.pdfIn PDF document text
    • http://spad.kr/userData/ebizro_board/file/vabonuvenatabe.pdfIn PDF document text
    • http://ersenergy.com/UserFiles/file/14022182920.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/fikumevoda.pdfIn PDF document text
    • http://140.121.161.111/ckfinder/userfiles/files/gezolakudaluvepan.pdfPDF link annotation
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/28a34c77197ceddf2fb0ce1fd9394c41/62920821548.pdfIn PDF document text
    • http://egyptlance.com/userfiles/file/84870043400.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/ginefavejin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=mafia+ppsspp+downloadPDF 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_off0000d7dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEF 18512 bytes
SHA-256: 1db006c3554107a888e09ccde2b635eac94d96bd0772ddfe3fb6d3a059512a2f
font_02_sfnt_off00012030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12030 10240 bytes
SHA-256: 35e007da9e8b5cc8c030010ef7a691f973f0fc0530134935301d4975a89644e1