Malicious PDF — malware analysis report

Static analysis result for SHA-256 822896b994ce2e1b…

MALICIOUS

PDF

69.2 KB Created: 2021-09-25 00:20:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d2e72b7fba63e8e7744abb3b1f0d5196 SHA-1: ba36fa886984747aed2bbfa14e904255e13f2c0b SHA-256: 822896b994ce2e1b098eaaf708caa7cb4552435103c29cabd67743b33124967d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised or disposable domains, suggesting it functions as a link farm. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are probably used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crewmak.ru/uplcv?utm_term=good+dollar+apk PDF link annotation
    • https://u-spot.biz/js/ckfinder/userfiles/files/34055171116.pdfIn PDF document text
    • https://sintasyapi.com/img/userfiles/file/pukexovogon.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/9774151531.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/7976ee3e14a6a522a6b3eeae0eda3ad2/xekibevumerilizor.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/a29cb01c2990ce18e51873a89542e3c1/43290251464.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16149a11217330---3788206860.pdfIn PDF document text
    • http://shiny-baby.com/fileimage/file/poxujadurulufo.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1614cda7a72af6---wikebivalekerilup.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/83622297858.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/1884981460.pdfIn PDF document text
    • http://vietdubai.com/userfiles/file/vosumuz.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/7671195849.pdfIn PDF document text
    • http://diagcorlifescience.com/attachment/file/nasujowegiwivigalebevi.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/38650722666.pdfIn PDF document text
    • https://keongracun.org/contents/files/65832045561.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161491759ef5ac---wotukofonod.pdfIn PDF document text
    • http://tomboy2.com/images/library/File/dedejotimur.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161320bae3d311---xofatudosuru.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/66164347044.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/zeberufuzepovepelijogoni.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/silelenaz.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_off0000ad94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c5aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5AA 9924 bytes
SHA-256: c9b0dd64c3a151296c53d4e3c7b6116e7baaefd36dc0b04c3f5ec975dcd33330
font_02_sfnt_off0000db9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9F 17264 bytes
SHA-256: c56abea58cd45d5c256955301daecb15448fa4e9e79ffbed89c90c831405f812

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