Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a2fca0bc68f7c5a…

MALICIOUS

PDF

77.0 KB Created: 2021-09-19 20:15:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 80c7083e915826762886571c9d851682 SHA-1: 1b4f30f7a4fc53c0c38961503af1550d5c991499 SHA-256: 2a2fca0bc68f7c5adf91737fc8bb8fc5e8812924b73de993814c5904685e331f
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malicious intent. It contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting it functions as a link farm. The presence of external URIs and link farm heuristics strongly indicates an attempt to redirect users to potentially harmful sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16141d16711aed---43286857846.pdf In PDF document text
    • https://rais.bg/uploads/file/zutamexolujomi.pdfIn PDF document text
    • https://hotelgaric.com/upload/datoteke/zagutaxewevipofowo.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/fisaxatajifine.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/dedumopalinavo.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/reluzimufesivuji.pdfIn PDF document text
    • http://kelvista.lt/images/files/73634161099.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/314897135.pdfIn PDF document text
    • http://www.taxivanclass.com/uploads/ckfinder/files/28535122392.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/besiwuvurizam.pdfIn PDF document text
    • http://coaching-scolaire.net/userfiles/file/gejoxivazatun.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/22426874584.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/161423626ced5d---88095910355.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/51572682122.pdfIn PDF document text
    • http://prakseologia.eu/userfiles/file/jirobokab.pdfIn PDF document text
    • https://safetyhanoi.com/userfiles/file/ximararakeguwideleselajek.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/111c9aeca62f3c2542094fe1054492a8/jivalaxomemefetugari.pdfIn PDF document text
    • https://ecohort.biz/userfiles/files/solifitiradejupavikug.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/06f72ed021a68e5446c8d1dd6f995dd1/pumowetimowizotefat.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/59839138804.pdfIn PDF document text
    • http://soupworld.de/upload/file/pumozobedu.pdfIn PDF document text
    • https://mkontroll.hu/File/ruxazubewesafuxesosajuza.pdfIn PDF document text
    • http://moscreen.in/cmsfiles/file/69722344191.pdfIn PDF document text
    • http://chipgene.com/image/files/20210905_195127.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+to+get+unlimited+cod+points+in+call+of+duty+mobilePDF 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_off0000c353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC353 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB65 18708 bytes
SHA-256: 8c225a778e5eee4d45819c5b4ecfeef73091b3f740404cd23cb0837747545b8d
font_02_sfnt_off00010bd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD2 11292 bytes
SHA-256: 91278a64d2efdae1822f43d4bc66ebdb9282a3a6dd2da2c7f3b4fc05567e43bb

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