Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e09ac0be046ac7e…

MALICIOUS

PDF

79.5 KB Created: 2021-09-11 13:29:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: ab6945faa5099eee2df728cbf6648e96 SHA-1: 1da87b2426c99323c22fc4ff340f4ce85b59e76c SHA-256: 4e09ac0be046ac7ee94c8b2b5bd4c58c0c553d6a78b8b73c4d42a4ffba4f2a0e
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm to distribute further malicious content or conduct phishing. The presence of multiple external URIs and link farm indicators strongly suggests an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://kronospan-mofa.hu/editor_up/24203767875.pdf In PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/42739604875.pdfIn PDF document text
    • http://insureavisitor.com/userfiles/file/32265242215.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/56095204739.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613518fede271---xidaborilujujomob.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133899fe6c64---17898343049.pdfIn PDF document text
    • http://encino.ilovepokebar.com/uploads/files/bateridikukaxojovagosotev.pdfIn PDF document text
    • http://snuhonors.com/userfiles/file/vovirobemawuxutamugirug.pdfIn PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/6460186673.pdfIn PDF document text
    • http://gamboeng.com/assets/ckfinder/userfiles/files/rurisefexike.pdfIn PDF document text
    • http://aa-nusd.jp/95036305464.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/jofezoduzuwivuzu.pdfIn PDF document text
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/pubigefejogu.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/lelibabubodijitun.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/4d5aa7b3f8ac45375d2d655479c0046c/roxezukuwudizunuvoruxig.pdfIn PDF document text
    • https://generalaudit.pl/eurostyl/photos/file/76080352698.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/64118035517.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/b698980dee16fabb3f6c97bac7584654/wiwinosixazuxinosi.pdfIn PDF document text
    • http://king-ber.com/UploadFiles/file/20210906025739501.pdfIn PDF document text
    • https://thefencedocumentary.ca/adminfiles/file/47203865139.pdfIn PDF document text
    • http://vigova.vn/Images_upload/files/jofopix.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210903_075033.pdfIn PDF document text
    • http://luckysim.com/userfiles/file/31443488901.pdfIn PDF document text
    • http://imdmotors.com/uploadfile/file/2021091103503054.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/gugesuret.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+make+apk+filePDF 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_off0000d493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD493 10316 bytes
SHA-256: 9cd6fb3c45b0b63cf021e66802f120410a6dad5331a695e511a0634fe7bdb050
font_01_sfnt_off0000ebd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD7 17224 bytes
SHA-256: 6fe57f8c75197d28af0dbf863b85f186d9f6ac8809016b75607a342e57a44663
font_02_sfnt_off00011881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11881 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1