Malicious PDF — malware analysis report

Static analysis result for SHA-256 abe435305174a98c…

MALICIOUS

PDF

70.7 KB Created: 2021-09-10 07:05:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 68c380c7d1402aa8dd61318e4c11f09e SHA-1: 94f0906612d03ecd9bbde867724a7dbae1cc1d7f SHA-256: abe435305174a98c0d24e39155e9d738273505cb4a871aa78f9e245ff46323a9
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file functions as a link farm, containing numerous URLs pointing to potentially compromised websites. The ML classifier also strongly indicated maliciousness. The primary attack pattern observed is the use of a link farm to direct users to external, potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://kolbandibileklik.com/resimler/files/43818715469.pdf In PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/1903985916.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/5d7e72215755ed0143f8c673443eff8d/rezawixaxusumine.pdfIn PDF document text
    • http://ipublicity.cz/data/file/45055981171.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131e234b1f90---76757734730.pdfIn PDF document text
    • http://videotour24.com/data/fckupload/file/suwudotedoluxataziko.pdfIn PDF document text
    • http://pvvc.cz/files/domoruvexinugaluragagepak.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/53681a56d31892157dda5332be0b8fe4/21008399306.pdfIn PDF document text
    • http://hantverkarenisandby.se/UserFiles/files/biwudodubujat.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/vamiraweza.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/90634180814.pdfIn PDF document text
    • https://sinarlangit1.com/contents/files/100354024.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/koxemifikes.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/zonitanivo.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/wimokosogunezaxefuzo.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/zasureziw.pdfIn PDF document text
    • http://fcvperu.org/data/fcvperu/userfiles/file/34835160774.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/junaburutebupijukogilize.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/14788353498.pdfIn PDF document text
    • https://tarsiman.ee/files/file/dapejuzalavowufe.pdfIn PDF document text
    • http://vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/66231145681.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ac7c2279a---57025832731.pdfIn PDF document text
    • http://exima.kr/userData/board/file/65709161350.pdfIn PDF document text
    • http://newbiesites.com/userfiles/file/wipowubofivolugorupuj.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/31109307865.pdfIn PDF document text
    • http://yesfabric.com/images/upload/File/zusasezejevekezotuxog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=messenger+online+androidPDF 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_off0000b43e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB43E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC50 16080 bytes
SHA-256: 32eaf08fde188d46afce482d6c410980fb760b5146f9aafce8353738a3fed46d
font_02_sfnt_off0000f46d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46D 10316 bytes
SHA-256: d5007ba24cbf3373ae80ce851cb7fe1a6602ad58a07912ea8c6fc82732c48b25

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