Malicious PDF — malware analysis report

Static analysis result for SHA-256 5426ddabed5dd10c…

MALICIOUS

PDF

81.9 KB Created: 2021-09-05 03:26:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ce0af0e7d190e316b810afb51255daf0 SHA-1: e1c9ba8cefb21f514955e2b5b01defe1845bfefe SHA-256: 5426ddabed5dd10cf50a32d7b0ef5f2198c986d6ecb2bb21027c34ac1ba5be40
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://pametnidom.hr/pametne_kuce/userfiles/file/xajivupolamipataduk.pdf In PDF document text
    • http://greenld.com/userfiles/verezizawamap.pdfIn PDF document text
    • http://nessium.net/userfiles/file/xalanawuzobifi.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096638869533---duxijeze.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/wujolupumujipexutopomebam.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/8a40bf67f28c01480bd00aebe5e3a382/povawetetefomarilas.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/87525656310.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/c2728df4249cc862b2648d09ece66ebd/33306692535.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/5q8t7dmthmacqoh25imal9asj7/depusirotefozut.pdfIn PDF document text
    • http://elmaryapi.com/ckfinder/userfiles/files/buzabewori.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/15160276466.pdfIn PDF document text
    • https://safetyhanoi.com/userfiles/file/xiradifogi.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/55109813507.pdfIn PDF document text
    • https://cet.sk/res/file/149779576.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/figuvatuje.pdfIn PDF document text
    • https://mimpi1pusat.com/contents//files/nuwomop.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/81948088603.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d2b6755cc---gobozurovul.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/96dc4cce9872a52723046862f217667d/84393058468.pdfIn PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/wenidasizat.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ba1a33f0d9---80401670673.pdfIn PDF document text
    • http://starlightcelebre.org/clients/4/43/43e9139217482d7666ce300faf566241/File/pujupokokax.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210609045532.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=day+of+the+dead+movie+worksheet+answersPDF 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_off0000d7ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AD 18372 bytes
SHA-256: f78bc6e4121c36a2e830f0ee5fbfcfc4cfb971ba3ac3d605d665be9a17af5be2
font_01_sfnt_off0001071e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071E 10932 bytes
SHA-256: 2598d96747ded3a4bb1ddc78be79fe6996d697be1420b3e733392a9db5a2edad
font_02_sfnt_off0001205f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1205F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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