Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7aeeefc087fc7c2…

MALICIOUS

PDF

100.8 KB Created: 2021-09-13 23:05:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c56f1bd9dfad08d07da48326a7c09a0b SHA-1: 51969ad8185e55fd209bc63d1b05bca7510de129 SHA-256: e7aeeefc087fc7c2bebb356fdaf896f05c752d0ffed746c3ca6fb64815da5ca2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicates a pattern of using compromised WordPress uploads for hosting malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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 http://www.leasebridge.com/CKUPimg/files/38573989646.pdf In PDF document text
    • https://iohrp.org/f_files/files/telalaben.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161335d10f1e08---jupulodunuxazozogukukof.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/3289321729.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/13761832541.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/70261771792.pdfIn PDF document text
    • https://forssh.com/userfiles/file/lunufiwigurorevoxete.pdfIn PDF document text
    • https://pmapmc.com/userfiles/image/files/gubotuf.pdfIn PDF document text
    • http://fu-xin.tw/uploads/files/202109130403566900.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/79539863116.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/eaa44c13f0e5e1e92c971483c78c457a/47222404768.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/81582475941.pdfIn PDF document text
    • https://pointwebhost.com/calisma2/files/uploads/vutafurusasiremu.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/jumanelevuko.pdfIn PDF document text
    • http://tce.vn/imagesflashupload/file/52643736875.pdfIn PDF document text
    • http://travelcenterpuntos.com/campannas/file/2474969980.pdfIn PDF document text
    • https://www.seblocation.com/ckfinder/userfiles/files/filebijevusuzeginosokatin.pdfIn PDF document text
    • http://pepinieres-soupe.com/userfiles/file/tamodabumiwikix.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/67465084429.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371c3e4f993---dokazisawijekefomogixam.pdfIn PDF document text
    • http://sibaco.ru/ckfinder/userfiles/files/85203992505.pdfIn PDF document text
    • http://esrafisek.com/images_upload/files/memilifus.pdfIn PDF document text
    • http://geojeoceanhotel.com/userfiles/file/20210904230246.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/narebozimelikugejugabotez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=do+i+have+to+play+ni+no+kuni+1+before+2PDF 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_off000119f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13207 10972 bytes
SHA-256: 2d176e6af8fc85ad26641f2403ebd01c11f99287dc6c16cff9c0dbe2024938e5
font_02_sfnt_off00014b4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B4A 22300 bytes
SHA-256: 51b71ee2e81ac0d516e84cc6f896176a50f90f67fce87f723e06c8e98b9ae4bb