Malicious PDF — malware analysis report

Static analysis result for SHA-256 e782089d32151f26…

MALICIOUS

PDF

68.3 KB Created: 2021-09-26 02:30:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3348cf669ed5ee8e680458f2e33b53ea SHA-1: 9252835e9b77ece66ad62bd8a3e6120231ee347e SHA-256: e782089d32151f262f582eedc821b6c91a97dade231c98c82f1ae89a013f444b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs and is identified as a link farm, with many links pointing to compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous URLs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://bc2000.order-pro.com/ckfinder/userfiles/files/75422747135.pdf In PDF document text
    • http://mispuntossaga.com/campannas/file/mamuwuvadelilusupad.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/m7kg6tcq53msb4d15ftpn3pg3f/25356317567.pdfIn PDF document text
    • https://www.oalysa.cz/ckfinder/userfiles/files/47800923096.pdfIn PDF document text
    • http://all4pets.cz/ckfinder/userfiles/files/zujesak.pdfIn PDF document text
    • https://keyword-lda.pt/site/upload/file/40343582589.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/rowutu.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/16768184622.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-18/20210918113347615942.pdfIn PDF document text
    • http://mama-care.com/UserFiles/file/29663398739.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/65012241978.pdfIn PDF document text
    • https://maytinhdalat.vn/images/uploads/files/97540708801.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/4s9qdbjl6dcv95kpm29cl8u85f/folijakoterisarepekig.pdfIn PDF document text
    • http://king-ber.com/UploadFiles/file/20210905170957878.pdfIn PDF document text
    • http://1544-7419.net/upload/fckeditor/file/40906664540.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/8858663415.pdfIn PDF document text
    • https://lalicorne-hotel.com/userfiles/file/12865661163.pdfIn PDF document text
    • http://www.immo-uno.com/ckfinder/userfiles/files/82458220816.pdfIn PDF document text
    • https://dottoridegregorio.it/public/file/16764186789.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/dugonodinufidovulu.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/a5b2ef5c8a2530ac340bfe75fb227234/gizigosaz.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/wejezuwixopovusif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=iptv+free+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_off0000ad5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD5E 15400 bytes
SHA-256: 5410cd318389f198d9b7977423e9466a8c7073ae342dd1c44ebd7751591c8f1f
font_01_sfnt_off0000d4a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A9 10296 bytes
SHA-256: 825667399a736bbf2061ba60055002af9192baf334beb20415dda8868550ec28
font_02_sfnt_off0000ebfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1