Malicious PDF — malware analysis report

Static analysis result for SHA-256 30637c624bdccd0e…

MALICIOUS

PDF

113.3 KB Created: 2021-09-06 17:45:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bd6e66346f103dc1420f4fff77aff1b3 SHA-1: f061ef137f440892495254288cfc5654389c3234 SHA-256: 30637c624bdccd0e9bdd5ea459a36f76da78acab487806ed38e01088434b214d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a link farm pointing to compromised CMS uploads, likely intended to redirect users to malicious content. The document body is heavily obfuscated and unreadable, preventing further analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16080579748fdc---fojalenuv.pdf In PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160afd6e9b99ba---gedupitokobefujipelap.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nojopapiburef.pdfIn PDF document text
    • http://feg.vn/uploads/files/26975551701.pdfIn PDF document text
    • http://exdebt.bg/userfiles/file/44022799007.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607750c456787---93363516858.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/88882835786.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/fonejojuduveliwuto.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/45025303283.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3e4ed2877---42382953627.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/xuselipuwober.pdfIn PDF document text
    • http://doreenindiatours.com/userfiles/file/32796444439.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/wiluxos.pdfIn PDF document text
    • https://laserbeautymachine.net/d/files/62036269657.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/a3e1f6421e235aa234427b1dcb2b0939/tupabozimijukamoxewisoma.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/ab1f6672d1bbf359beaf794b89759bd1/tewibux.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/lufebabixozopetenexu.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/44656557862.pdfIn PDF document text
    • http://heritagecarletonplace.com/clients/c/c2/c23aa4fb54f25340752d20cfcff880b2/File/5211259224.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1611a46458bf59---15118788226.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/ee565736c2e2d68de2d070c6e3520ef7/6213883708.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4c249740c---1972411888.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/54460317312.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=vishnu+puranam+in+english+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_off00014f4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F4C 10796 bytes
SHA-256: 725d97e0ddf1f6a10e16dd54ba87980436b82628556878b157c8fd0dc87d6232
font_01_sfnt_off000167ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167AE 21348 bytes
SHA-256: f7c23bd3f30712ccf64d357d782fb4907ac22cef029d10123135b070eeaa2d4b
font_02_sfnt_off00019f32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19F32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1