Malicious PDF — malware analysis report

Static analysis result for SHA-256 87ea1e5d938bf3d8…

MALICIOUS

PDF

84.4 KB Created: 2021-09-20 21:49:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0be65c9ac1cc396e6911f2aa729b0aae SHA-1: be523c35552f37089da65a9d2b6e5b03e4620e17 SHA-256: 87ea1e5d938bf3d823086195b30f2e08c19794f058e8c283e8082b5d71423ddc
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links, many pointing to compromised WordPress uploads or disposable hosting. These links are likely used to redirect users to malicious sites for phishing or malware delivery. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://chinazzjx.com/d/files/56114280919.pdf In PDF document text
    • http://disonde.com/filespath/files/20210911013648.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/kazepeso.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-9/file/nupoxunorobori.pdfIn PDF document text
    • https://nhatngudongkinh.phapluatvietnam.com/upload/ckupload/files/39460563855.pdfIn PDF document text
    • https://ganganagardentist.com/userfiles/file/ritetezuseravo.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/1248473683.pdfIn PDF document text
    • https://magerp.org/upload/files/wuzom.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/nafozobarazolivijowotimu.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144b03eea529---zofolafikapobiwa.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c30e51bc1---datop.pdfIn PDF document text
    • http://perfekt-dom.pl/designhome/admin/userfiles/file/33805959129.pdfIn PDF document text
    • http://jaatkinson.com/userimages/kevazosomolajadejiga.pdfIn PDF document text
    • https://homecareangels.ca/files/files/files/49735165527.pdfIn PDF document text
    • http://ambulatorioveterinariosantanna.eu/userfiles/files/piburixikonopap.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210913201133720.pdfIn PDF document text
    • https://euinsuti.uniluxgym.ro/app/webroot/files/userfiles/files/35382029798.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/kofarobikuzodezosij.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145a71ccda0a---69694734768.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/16127249543.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/koliselopumuloze.pdfIn PDF document text
    • http://4226080.kad.tw/kads/ckfinder/userfiles/files/pamidotovivageregi.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/wuzamejikes.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147d81b4358f---defutejivafukakajixolised.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021090315285398.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=android+glsurfaceview+tutorialPDF 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_off0000e46b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE46B 10884 bytes
SHA-256: 2b00254a27ccd07fbe8b00ff73250846194171ebb9c0a91127f119278c8a301d
font_01_sfnt_off0000fd9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115AF 17504 bytes
SHA-256: 7ee49f56b364ff8356b6f18f75d539b73a5700f022cec013a78e69578cf874a6