Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f82f98777421ede…

MALICIOUS

PDF

77.0 KB Created: 2021-09-20 14:56:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3d07885bfc4b754c93c2da08ec27a8b3 SHA-1: e14d2a91783fb72595632d03ad1486a7caaedd98 SHA-256: 9f82f98777421ede3c0ecda50e13873b8fdc6b834fc429e5c351134f9f3534e2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm with multiple external URIs, some of which point to compromised CMS upload storage, suggesting an attempt to lure users to malicious content. An embedded JavaScript stream was also detected, indicating potential for further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://bela.geekers.tw/upload/file_folder/file/wixefavaviburixaxurov.pdf In PDF document text
    • https://kimcert.net/E/file/janegadevunojunapazubum.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/38581213554.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/14128565115.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147c88e49195---lifobufenugedosumofatova.pdfIn PDF document text
    • http://pascalparrot.com/uploads/assets/file/wirupezavofu.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/65420916680.pdfIn PDF document text
    • http://tufaghanafc.com/js/ckfinder/userfiles/files/dabazigidawevirakak.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/54935220907.pdfIn PDF document text
    • http://lawfirm.vn/MINH/user_files/file/mudosakefitoxexopa.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/zajirikojuminamu.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/doxazuvukowuko.pdfIn PDF document text
    • http://hotstamping.pl/files/file/zuzem.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139c04eb3afc---zefejejarufarite.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/sumitiladasoses.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613abfd698286---46341380326.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614209d418347---10594386033.pdfIn PDF document text
    • https://soudurelausiere.com/upload/editor/file/60611502209.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b21d23f3fecadb5e4ad5afd53dfa9f11/jabajenuvirenuziralasuro.pdfIn PDF document text
    • http://htbestcomputer.com/media/ftp/file/kapujunoromewaser.pdfIn PDF document text
    • http://mertcelikkapi.com/userfiles/file/zudixasudagolazelizojomim.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/16991066957.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=the+kissing+booth+2018+onlinePDF 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_off0000c875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC875 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE087 17532 bytes
SHA-256: 96e4541d32af3cc51339be987ddbe00b75c53f6737a4e66a2923ef6662ff0eea
font_02_sfnt_off00010dbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBB 10824 bytes
SHA-256: 9457fc5e2d3bf96c6a547e99a727bd3c8108f99104994975414ab967070b78ef

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