Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb250ca5842acf27…

MALICIOUS

PDF

94.1 KB Created: 2021-09-04 11:21:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8399ce727ec34419bb3630aac6fb4d7f SHA-1: e2c902f8b23f619097ca6c3f215ce3f193578708 SHA-256: cb250ca5842acf2786f52139a164c262a0dff873537a5d8556ffe9c5184567db
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 websites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://constantemail.com/userfiles/file/162688190840483563412.pdf In PDF document text
    • http://topmebli.com/content/xuploadimages/file/86256209375.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/abc28273acd31ab26f6d8b2014256960/fototafunefuxezirelitu.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/feduro.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/81bcccffb658ec0c5be56a650d99ee76/dedolojami.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/weraworavora.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/72895d132d0309d8928bc75714760a94/86600798475.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/jarotugabun.pdfIn PDF document text
    • https://ms02bet.net/contents//files/sepupemuzikikefubopatisa.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/61535419576.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a39c2654e9f---rixawa.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/0426m0bk4rcv4qq0qnh01bdqjo/4988848611.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image//files/xitabepiv.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f08176e9d78---dusikor.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16085493a33b62---62749789685.pdfIn PDF document text
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/ginamenuzorufesaxapegiru.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/0seqptl4id2f924usv4tq2dfk3/sexusapemudadujat.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/17829086510.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/jonanotawapejodiride.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/9e08724fc3ac2cac1eed7767ab428a53/13503815046.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/81234172423.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/63849908756.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/wutanud.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/6474083895.pdfIn PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/16458213857.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=asml+lithography+pdfPDF 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_off000108c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C4 10804 bytes
SHA-256: 8dabed38e42d3bce4e08abd29fa6be3c5e26ae5a2a03cdaee65bfeb88de36dc4
font_01_sfnt_off0001217b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1217B 18692 bytes
SHA-256: 1e5ee17f8fc93efbb16f34b09f1d1cefe2f7ecc46f45ad47f7b662d353d3ec4d
font_02_sfnt_off00015286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15286 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1