Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bd2561493d34736…

MALICIOUS

PDF

79.1 KB Created: 2021-09-06 21:56:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d367e63aec485681bc175d845cc0a468 SHA-1: 230a8471daf9a9c80cbde5b60a796a544feb44f5 SHA-256: 1bd2561493d34736d4c7632d0d6793bbc703b94bfd2e44fccc56a0a61184a250
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, forming a link farm. These elements suggest the PDF is designed to lure users to download further malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • 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://huntic.ru/uplcv?utm_term=difference+between+rational+and+irrational+numbers+worksheet PDF link annotation
    • http://stisk.com/file/11522100972.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/tv3vq7j57punbauge31bgt1m6s/81022030667.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/ligotok.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/731892013579467807fcf660c683079f/41539133225.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/xomikebegakebazorotigodov.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/zinexojajad.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/vovadokuvedadikex.pdfIn PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/kapolulezepetunogusobolip.pdfIn PDF document text
    • https://travelstore.tn/userfiles/file/68950789320.pdfIn PDF document text
    • http://daisin1977.com/js/upload/files/gesejeworedopojofafawigo.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/21595241376.pdfIn PDF document text
    • http://riph.pl/userfiles/file/nozete.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/mazebowijemabajudo.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1844549e60---wusajetazas.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/wuguloxaluwatifujoviril.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/repiboj.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/65735136044.pdfIn PDF document text
    • http://onlytech-tunisie.com/userfiles/file/84632977914.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/n9gqc8e75gs0jrad7dkebokcqn/zipevujexuvatanofudakov.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/nosavedorokagobotiwozef.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/01c010c56575a3beef8a54987ca4863a/kujevetotakimikoge.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/63337215550.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_off0000ce97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE97 17412 bytes
SHA-256: 436cd4e8663bce62eea1e1b487305da9fe39412939b7677cbfc9c7fed1966fe8
font_01_sfnt_off0000fc16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001142d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1142D 11160 bytes
SHA-256: e77a389c3dca4513acf9d30f6ec8543a1cdd19645e67b3cd21ef0e9d5efdac1f

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