Malicious PDF — malware analysis report

Static analysis result for SHA-256 b17656b16f579acf…

MALICIOUS

PDF

93.1 KB Created: 2021-09-01 16:20:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2850927d2bdec0e3051165f1c4e85cb9 SHA-1: 1465ff7cb83a4cbe6978ecb6cc0644b6626eda07 SHA-256: b17656b16f579acfcc16dcc27c5bc150ce000d28984745a9943cbc0ad66bb9ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to lure users to potentially malicious destinations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://catamma.ru/uplcv?utm_term=wow+mage+fire+guide PDF link annotation
    • https://alariel.be/userfiles/file/42108760136.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/1vqqfo8t1o758vacqcsqviqu11/98805477374.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2a734af1d---zovalosadodor.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/98187662484.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/70670569774.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/004d1cc774d4808955d683a0e9384822/rododinitifonipijena.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-5-14/20210514214925828375.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/nigofufuvopiv.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d810da5e10---lunajabu.pdfIn PDF document text
    • http://zussobrance.sk/grafika/dokumenty/kafekekituxegen.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/8558514115.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c607ce856f9---vusebarisave.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/27603395777.pdfIn PDF document text
    • https://cokhivietuc.com/img-vietuc/files/lelibinaxexarelok.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/93899535662.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7f4e2dbcd---zudobiwamemif.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/7eced8ad9787e1c751e9f8400623e92e/kezipimuwiga.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/12070679781.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/zofokerejunivewetexidar.pdfIn PDF document text
    • http://cuuhoatudong.com/upload/files/36751881298.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/nipubog.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/34c2c344d05e1eef9575251fa89543cb/xuropo.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/pekiritegufizoz.pdfIn PDF document text
    • http://kaies.net/upfiles/210803005017876971ng104b.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b427b876e02---gubezejuserifo.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_off0001057b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011d8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D8D 18596 bytes
SHA-256: ed0176e90ef8f0ed324b974460c765b47a3db839faf520c37769d9b05c157adc
font_02_sfnt_off00014dca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DCA 10460 bytes
SHA-256: 341c744faa8c582c035cc304de35d3e0409b1e805d9f24064a80e24045928dc0

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