Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7b760149bca165b…

MALICIOUS

PDF

79.5 KB Created: 2021-09-19 07:31:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0be7555eb01ad09aec9215a2e28f36d9 SHA-1: 89862e75ac4bed81fb9defb359a83632e2b2217e SHA-256: b7b760149bca165ba247fccc6086faad3d1dac86d717f3bd0c8158281c0327a4
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://www.musicboxpiano.com/contentfiles/22216319982.pdf In PDF document text
    • http://uptindia.com/newsimages/file///91763025526.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/75076253535.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/8nvoond5i2odh4h27r2bcja5pc/9507926556.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/nuzumixozarabudikowan.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613617cf87eaf---ziledaju.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613e416f45a41---luvonuker.pdfIn PDF document text
    • http://tunecharts.com/userfiles/file/tulanuwelubazovave.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/78635218538.pdfIn PDF document text
    • http://tg-focus.ru/userfiles/files/6104341703.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/a6fdec21766feacd669ee16387bc9375/48479117196.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/27567160231.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/fagixuxirotuwitetododibog.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/55621704084.pdfIn PDF document text
    • http://qianshunqs.com/admin/upload/93863796030.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/86102258792.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/xefivulukosaxexolo.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/22846608176.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/bowifabebusesozelob.pdfIn PDF document text
    • http://mijn-nederland.nl/userfiles/file/24386531283.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/vogokigabujogol.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d8715f5cf---pipizege.pdfIn PDF document text
    • http://4darchitecture.org/img/all/bakojafavulotedozexod.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210910000044618.pdfIn PDF document text
    • http://uklearningnetwork.com/userfiles/file/zazosonopazuzibaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=five+letter+words+starting+with+gePDF 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_off0000d1d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D5 17964 bytes
SHA-256: e82212cdba53133501fdfcd85a8de67805dfdb0bf2d528e3010c937ee2fe19eb
font_01_sfnt_off0001004c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004C 10656 bytes
SHA-256: 6b003ae311c9544f2ac8b8829093edbb54bd03b5983f87b40c42e4177f5b71f3
font_02_sfnt_off0001187c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1187C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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