Malicious PDF — malware analysis report

Static analysis result for SHA-256 861179de82eb6367…

MALICIOUS

PDF

72.0 KB Created: 2021-09-25 20:53:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 418909d96dd511aedbbd15e9a5e7f71b SHA-1: b7afde9f284bc815d8a9f2af6000d78ef16ed8cc SHA-256: 861179de82eb6367c0d7b5e2f013ae20260ec8618835df872ffb8878948701ab
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://irlanc.ru/uplcv?utm_term=cast+android+device+to+pc PDF link annotation
    • https://leo.tw/upload/ckeditor/files/64215141301.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/dusetawagenugufejejo.pdfIn PDF document text
    • https://fuze-pay.com/ckfinder/userfiles/files/75333133057.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///pofakewode.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ad77364fd4---7463436502.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/hleaqtpu7msqglr85gkb1o1n50/wowenisubomamabuwukuga.pdfIn PDF document text
    • https://renewone.de/files/21324004187.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/1536149329.pdfIn PDF document text
    • https://liepasmuiza.lv/userfiles/library/mefamijotezika.pdfIn PDF document text
    • http://dtjxbpzx.com/filespath/files/20210922155519.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/44843584730.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d5f2aa4ca---kinedozafetotatutara.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/gimovubavo.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/68464980438.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/6466384773.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/nopirowebuwo.pdfIn PDF document text
    • http://terhautz.com/upload_files/files/kikopelu.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210916_173555.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/49593199021.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/20556464991.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/zumepaxejifizagixokixobo.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/33518923384.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/niberekorezanaf.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_off0000b4c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4C2 10556 bytes
SHA-256: 18655b20ab1f50dfa7913081bd7f44acdc3c533af8cd85940650b3276e524f5f
font_01_sfnt_off0000ccf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF9 17832 bytes
SHA-256: d3a405c0588b53193e85601546d8117afb3e20608936df6842b2fe1bd619ff3c
font_02_sfnt_off0000fa3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1