Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc2c0d8d8d757237…

MALICIOUS

PDF

86.5 KB Created: 2021-10-08 20:47:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: f08838ba9ae4add9f30cce0eb189b835 SHA-1: 9e2a897a4ab9866cc9fee05084d12b33177de9e3 SHA-256: bc2c0d8d8d757237ab938f40489c7ab71fc615e9ee259e5da22aa3627af1d57a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is used to host and present these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cructi.ru/uplcv?utm_term=lips+stinging+and+dry PDF link annotation
    • http://permagnet.com/upload_files/file/210922205316883642pxvwfc.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20211003_848FA10864401209.pdfIn PDF document text
    • https://rais.bg/uploads/file/mizukupawezarufunufibefat.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/fepagakopamagijulama.pdfIn PDF document text
    • http://bankerz.in/qpic/files/76646832455.pdfIn PDF document text
    • http://damutech.kz/upload/2021/09files/210902060024935189dh27y.pdfIn PDF document text
    • https://phongkhamtamthan.net/uploadeditor/files/penukufasuzizowal.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/58312256514.pdfIn PDF document text
    • http://hodori247.com/uploads/files/47646230195.pdfIn PDF document text
    • http://congluc.com/upload/files/gakofiboparulugunulajuf.pdfIn PDF document text
    • https://lixtech.com.tw/ckfinder/ckfiles/files/fubireti.pdfIn PDF document text
    • http://willajarmar.pl/userfiles/file/64678174045.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16149dd221702f---pupon.pdfIn PDF document text
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/38553189856.pdfIn PDF document text
    • https://mimpidia.com/contents/files/viteloxujukozi.pdfIn PDF document text
    • https://vnycc.com/userfiles/file/somaluxofizom.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/161483ea9a3537---46875307738.pdfIn PDF document text
    • https://tonmathunglan.vn/upload/files/padetesopigorux.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/dijotumetudarag.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/89980612476.pdfIn PDF document text
    • https://ceramicasvillaflor.cl/UserFiles/File/44045449037.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/44162143988.pdfIn PDF document text
    • http://haki.vn/uploads/files/noteluzajefezuj.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/11945156621.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7808aa1a1---wadataba.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/lewuri.pdfIn PDF document text
    • 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_off0000e8a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A4 10340 bytes
SHA-256: e2a361418175b63f08c3f0b54d15df607f0a06cec607cb178829054e2a5978dc
font_01_sfnt_off0000ffe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F8 20024 bytes
SHA-256: a3f31e5abbeccc3ecc049087e8f4842c5bcca7836a3142f827abdc48ff4aa59e

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