Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fb2f8108d5b904e…

MALICIOUS

PDF

76.9 KB Created: 2021-09-20 21:08:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9a50519576b1ad36532512f5e299e89d SHA-1: 670f608b7b39730d2ab29de1717e73fe5967756d SHA-256: 3fb2f8108d5b904e08c94c544d35617822f6bd0c50f4946ccc9adb4c44560ef3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to potentially compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. While no scripts were extracted, the structure and embedded links strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://uslugi-ogrodnicze.pl/pliki/File/kuvukugadodoxogepamizago.pdf In PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddc05ae13a---79403039802.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210903030356.pdfIn PDF document text
    • http://konikanarrowfab.com/ckfinder/userfiles/files/lejegokazoloko.pdfIn PDF document text
    • http://decoworld.in/dayafter/uploadimages/newsimages/file/3577889762.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/87494815301.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab32dd56f1---37206388870.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/80695591924.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/95568935224.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/taxosezigavifizozi.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/56201389676.pdfIn PDF document text
    • http://cdio.vn/uploads/userfiles/file/xovefifogofotunekavu.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/46611733401.pdfIn PDF document text
    • https://irantruck.ir/data/file/javuvimijigogonefojosem.pdfIn PDF document text
    • http://ipsaix.com/ckeditor/ckfinder/userfiles/files/72961717708.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/wajiwu.pdfIn PDF document text
    • http://harrodsrentacar.com/public_html/userfiles/file/vosibimuwo.pdfIn PDF document text
    • http://brenderup.ro/mm/file/pugasafu.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/rutapuroso.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/dc2e94457fb486cf92b6e605d0d1ae03/94088924103.pdfIn PDF document text
    • http://travelcenterpuntos.com/campannas/file/ketisumojakefozab.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/19739462378.pdfIn PDF document text
    • http://chanhungcorp.com/images/uploads/files/30327184363.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=hide+n+seek+mini+game+hack+apkPDF 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_off0000c7e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E8 17752 bytes
SHA-256: f2ec02c8599888cd4aef39003a4d9c474d3dabdfe99a6ee24ee38e1de7f7487f
font_01_sfnt_off0000f5f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F5 10680 bytes
SHA-256: 4d883d2a30f6b852c52697e9f1d50fc8730559cf94300695f265821564529403
font_02_sfnt_off00010dfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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