Malicious PDF — malware analysis report

Static analysis result for SHA-256 799517c2f341d2ba…

MALICIOUS

PDF

85.4 KB Created: 2021-08-10 03:59:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a5aa3224d0aad93d0bf70a370c7c875f SHA-1: 9b38e2cb4aeee23fc0a2e184100dbae3de0c4efc SHA-256: 799517c2f341d2baa05cee6dec8d15f20a426c703f569f146de0a162816f6c2a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model indicated a high probability of maliciousness. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 http://stressmanagement-karriere.de/userfiles/file/47364645368.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16082228c5c0eb---lekefugadekekogag.pdf
    • http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/nulatozuwupekiwemox.pdf
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d403438fb---70080972240.pdf
    • http://thainightjob.com/ckfinder/userfiles/files/98437695012.pdf
    • http://jorkurojus.com/userfiles/file/30127507326.pdf
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/dd29caa4097f8b1b31e980c2d1744503/nivel.pdf
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/36e1c82f5f64396d533a2895a6961eae/jemukirujatemojedat.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/f6fa442ddc98e056619467e4c50e010c/5809559607.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1faa60d5aa---xekataxumaf.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/cc518bl3enksfn8qmg324aqbqh/49620014356.pdf
    • http://yuha.be/_files/file/84328016259.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e5675d64ba---33063238515.pdf
    • http://www.anjhimayath.com/upload/file/vozodepifutoniragufudemu.pdf
    • https://ysh.my/userfiles/file/tusom.pdf
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d6b36fb6e2e---82848127693.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/d5e02c18edf3bc2d3e67fe7d1d099113/41181156062.pdf
    • https://miguktour.com/FileData/ckfinder/files/20210604_F0FD086599E836C9.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5c030b22a---zisoxaropewob.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160abfabc7c52c---gurimelaluraxesugowoz.pdf
    • http://mega.kz/media/upload/files/38129774024.pdf
    • http://digemnd.com/UserFiles/file/dedowel.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+redeem+1+million+dollars+in+gta+5+premium+edition
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e40b.bin
cf03a70b5a1387003f85f8ae15d9a5b55cb910979484aa2bb5296021107f72e7
pdf-font-stream PDF embedded font (sfnt) at offset 0xE40B 18500 bytes
font_01_sfnt_off000114b8.bin
9283e54ef7b9ca28dd986ba352df2fb796f887ba1fc6661262f2c0c10f0d4bb4
pdf-font-stream PDF embedded font (sfnt) at offset 0x114B8 11100 bytes
font_02_sfnt_off00012e7a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E7A 16792 bytes