Malicious PDF — malware analysis report

Static analysis result for SHA-256 cba412633c8a61c9…

MALICIOUS

PDF

78.1 KB Created: 2021-10-06 19:50:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 1b1af522c373581441122d6501673925 SHA-1: 62122f1d981daf6f61ec51398f468e98c2a9a256 SHA-256: cba412633c8a61c948eb5324bb9f11b3d7539b7e5629ae1a9e29350097256cca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by a ML classifier and ClamAV, detecting it as a phishing trojan. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to external sites. Several of these URLs are hosted on compromised WordPress installations or utilize disposable domains, suggesting an attempt to lure users to malicious content or phishing pages. No scripts were extracted, but the PDF structure and embedded URLs strongly indicate a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laborke.ru/uplcv?utm_term=definition+of+the+word+innocuous PDF link annotation
    • https://edenestates.com/ckfinder/userfiles/files/17050544316.pdfIn PDF document text
    • https://birotex.rs/images/files/maregukogawedixoxozuzop.pdfIn PDF document text
    • http://thongthien.vn/upload/files/13464666838.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161331c0090f6a---55683297371.pdfIn PDF document text
    • https://rainwater.cc/images/uploads/files/11161200404.pdfIn PDF document text
    • http://zatexpress.com/upload/userfiles/files/96660139303.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8492ced58---83078035339.pdfIn PDF document text
    • https://dodatnojamstvo.com/userfiles/file/venuwekar.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/xutizajafabum.pdfIn PDF document text
    • https://austarpharma.austarchina.com/upload/files/17033973303.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/70234925967.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1615d8ac121161---25412690108.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/sozenuwexozadiruv.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/11159542337.pdfIn PDF document text
    • https://xn--90aweabvm.xn--p1ai/ckfinder/userfiles/files/46869943270.pdfIn PDF document text
    • https://brincandoeaprendendo.com/fotosempresa/files/gunubesililulege.pdfIn PDF document text
    • https://vinacoma3.vn/userfiles/file/41061773057.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/xufonulofoge.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/67919556295.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/45lssfke772do2tlrdl8jmnakc/funap.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/81537262995.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/61b7930c521a1e4726151a4a92db326a/rowijovu.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/7b5e127277fab52ede85ac5232aac628/bumewikojawoxowomi.pdfIn PDF document text
    • http://luxlustry.ru/img/upload/42991438104.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_off0000cac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC8 18676 bytes
SHA-256: 48600f61062ac7e76665f14efa4256c5d17a6795593416f125eea99920975971
font_01_sfnt_off0000fabd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABD 10552 bytes
SHA-256: ab3a09cacee2bf6e537e734ad7bbba674d23d81c65acf8299aaca858f4c88155
font_02_sfnt_off000112d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.