Malicious PDF — malware analysis report

Static analysis result for SHA-256 59901544d55b963e…

MALICIOUS

PDF

92.7 KB Created: 2021-09-09 06:42:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c53999e70117186221852e8e7da86b61 SHA-1: 47423b04576fcb187ad3f45b88628b35cc198dab SHA-256: 59901544d55b963ed9c3d5a1d204acfdd566d73b578faafd6af9900e03f6c536
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to websites hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://www.mattig-accounting.bg/fisiere/file/tagobigedinosizulupupiti.pdf
    • https://cvssteelex.com/ckfinder/userfiles/files/27996181178.pdf
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/60147776373.pdf
    • https://thefencedocumentary.ca/adminfiles/file/18532517666.pdf
    • http://lpxs168.com/filespath/files/20210905230459.pdf
    • http://exosushi.com/uploads/files/xutexe.pdf
    • https://bhavanarayanaswamy.org/userfiles/file/54846005319.pdf
    • http://batiment-tunisie.com/userfiles/file/jasawuvo.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132fbfb97117---bojexexawiniji.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/r2ufvcdrhprkm8g9h1u4smb82t/98486721600.pdf
    • http://iccjsc.com/images/uploads/files/98786873302.pdf
    • http://benetworkingpro.com/ckfinder/userfiles/files/41869732420.pdf
    • http://strahyi.ru/images/file/kalamekavitukitu.pdf
    • http://www.mediagrand.hu/data/editorfile/58336786606.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16130200dd4e36---xolivuwevepamotadan.pdf
    • http://jlsxjy.com/right/UploadFile/file///2021090319505873499.pdf
    • http://dongzzang.com/userfiles/file///ganut.pdf
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/nosuxubele.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/1dcbe911f44329750e0e834b26daa5ac/dijowidepeta.pdf
    • http://spreewaldatelier.de/img/editor/file/41392415607.pdf
    • http://emanuelarombiarchitetto.eu/userfiles/files/tukodifajimil.pdf
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/leloropape.pdf
    • https://onlineadda.organicemall.com/ckfinder/userfiles/files/31052800511.pdf
    • http://ageddfjtj.pretty-match.com/upload/files/38037697189.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=samsung+a50+custom+rom+android+10
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101f7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x101F7 16792 bytes
font_01_sfnt_off00011a09.bin
d8fd19e6dfd391e0f6134e90710107574be4834d02ce43ac78ec21028afe30c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A09 19052 bytes
font_02_sfnt_off00014b75.bin
021d4b4ffc1b3bef8c46141371e701dfca98ced415dc73ce905d150cb89689e4
pdf-font-stream PDF embedded font (sfnt) at offset 0x14B75 11020 bytes