Malicious PDF — malware analysis report

Static analysis result for SHA-256 94a81ba89b6f3659…

MALICIOUS

PDF

85.2 KB Created: 2021-09-14 10:15:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a23ef625dad8441e647af49b33cfd358 SHA-1: 0eed9d345f7349bd8996022f9dd30158b5d9d89b SHA-256: 94a81ba89b6f3659825267e1c99c10b11ff5689dbcbd7f8d8ca587f994469de0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It contains numerous links to external websites, many hosted on disposable domains or compromised CMS uploads, suggesting a link farm or phishing lure. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 https://tidurmalam.com/contents/files/41961817761.pdf In PDF document text
    • https://permargi.com/files/galeria/files/fixubizifitodorozuw.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/jilebitamesa.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/sugejusaluwapus.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/92971608901.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c813243cf4---babadoj.pdfIn PDF document text
    • http://tianfonmm.com/d/files/26172699854.pdfIn PDF document text
    • http://zhjpharm.com/upload/files/85416743969.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/rotimelovu.pdfIn PDF document text
    • http://royalwedding.jp/images/blog/file/97514957678.pdfIn PDF document text
    • https://bdlvn.com/steel/upload/files/835272300.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/damizipixidakaxijona.pdfIn PDF document text
    • http://king-ber.com/UploadFiles/file/20210914141746688.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/36900510660.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/b502c909b28ab02b98a2f0c12e438818/nodimuvex.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/femutitaxavamawomizuwekaw.pdfIn PDF document text
    • https://biocenfis.es/uploads/assets/file/81069683832.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/delokudarajaxuxepam.pdfIn PDF document text
    • https://associazionemusicaviva.it/uploads/file/90727336155.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/89097317777.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/xokowikafitigamudu.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/48665893364.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/7bfe877bf71a76300459a6e080494c1c/38297111343.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/65452553977.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/demepufil.pdfIn PDF document text
    • http://mail.teleserviciomalaga.com/ckfinder/userfiles/files/vofofovewagag.pdfIn PDF document text
    • http://numere-mopede.ro/mm/file/zunat.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/21108699804.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=adb+start+packagePDF 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_off0000e81b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81B 17752 bytes
SHA-256: fd152b219f194af2c6d8cd1c5d03d696d9271ed0ccfccdba65ca2fec9d179a7f
font_01_sfnt_off000116b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ECE 10540 bytes
SHA-256: e65ebc5f725be81b6118136171020776c6adbfa431043a40a9b9bd7bb31ea4f0