Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dd506fe34727429…

MALICIOUS

PDF

117.0 KB Created: 2021-07-03 09:23:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a0f0ca02d14e36621ca922a7ef2a01a2 SHA-1: 6955ffbf005edba1d28c2e35fbefc84a660f2af1 SHA-256: 1dd506fe34727429dc940f7fe0b70b1d45d1e66496cc61f0c4b368ceaa43beab
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites or exploit vulnerabilities. The heuristic firings indicate a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malware or phish for credentials. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://aznamaste.com/ckfinder/userfiles/files/17138852625.pdf In PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606d9bfac0162---793632293.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/pa6m6id065fp609q33hulh2qn7/19701163758.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b105a15c81e---86714323964.pdfIn PDF document text
    • http://ekotronic.eu/files/file/78971392433.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c06ab3adcfe---jalag.pdfIn PDF document text
    • https://circolodelpistone.ch/userfiles/file/42966142680.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160982fceef97a---sijojetogakoturidep.pdfIn PDF document text
    • http://truthtube.com/UserFiles/file/raxerevixinu.pdfIn PDF document text
    • http://hb1004.com/userData/board/file/96019450730.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/51427190885.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/86103394094.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a149b1bdc7c---topazofuxakatiwaginiwupi.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/dafab.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/sebusoxumotozap.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/zegoxonutati.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773eb33318b---59713089380.pdfIn PDF document text
    • https://tonitomov.com/picture/file/kozosedijolo.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba2762d7128---72564672626.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/b21a6d19f611bebe6fcf3dce089f9105/bipokepokusopi.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/sefejogip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=solution+manual+of+introduction+to+electrodynamics+by+griffith+4th+edition+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_off00015bd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BD2 20408 bytes
SHA-256: 63b2ecb14fc498c016d7bfc84f67f75b4bbdb928fbd54b2ce93f53058bc6ba16
font_01_sfnt_off000192e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x192E9 11572 bytes
SHA-256: f601c5cb65f4342e3e515145ee342a93d74750c898c9687b1125d09ffdafcbc4
font_02_sfnt_off0001adce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ADCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1