Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d9a28a1034341b4…

MALICIOUS

PDF

86.9 KB Created: 2021-09-11 20:57:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 291019edd9cd64190ed9cc6aa4a0d216 SHA-1: aa57f8dc7ce2829731bfdb4522513252307c0200 SHA-256: 4d9a28a1034341b4224b504fc59d5fc86cc5f2af3d712baed8bbe2efc217797d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious sites or download further payloads. Several heuristics indicate the PDF is part of a link farm, with many URLs pointing to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://itexpertdog.nwoasis.com/upload/files/sapofixisewuwezakepopuk.pdf In PDF document text
    • http://bkmarine.net/ckfinder/userfiles/files/1631261336.pdfIn PDF document text
    • http://tabouligrill.com/ckfinder/userfiles/files/20524614857.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16138ba8697fd5---472936737.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/xamagobizar.pdfIn PDF document text
    • http://gtlfuelmarine.com/userfiles/file/mimaribigipezum.pdfIn PDF document text
    • http://kahasat.cz/data/file/koronifewukesomudatal.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/dixikubanurokasozarovo.pdfIn PDF document text
    • https://smg.bid/ckfinder_userfiles/files/pedon.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210910205031.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161316226d3657---76290808790.pdfIn PDF document text
    • https://xn--psg-9lac.hu/files/files/nipujokumebovoxas.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161304a0505ba5---boxapebubevonak.pdfIn PDF document text
    • http://techcessgroups.com/userfiles/file/naniluzinibutamibulala.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/sofonezane.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/58794124842.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/30638125960.pdfIn PDF document text
    • https://codefon.hu/js/ckfinder/userfiles/files/zuzad.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/xepenujad.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/7002315269.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/rojamuwusafojafigexax.pdfIn PDF document text
    • http://elfast.ru/userfiles/file/xuzobutovajobuwiki.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/watuporiniva.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/wefigadifoludos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=download+miui+pocophone+f1PDF link annotation
    • http://perfecturology.cafe24.com/upload/editor/imagefile/gijujazopusepanenebofewix.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_off0000eca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA8 18324 bytes
SHA-256: 86ece5fcdb31c0f093f750c8f8233c84c15a15382d8cecbc8fe4881fe0eeca2e
font_01_sfnt_off00011cf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001350b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1350B 10760 bytes
SHA-256: de7dc1df7f7d3ac8f406940f9a4c2bff7a885a95499beb8f7cd82e75482d3d0e

Open this report in the interactive analyzer, or submit your own file for analysis.