Malicious PDF — malware analysis report

Static analysis result for SHA-256 e62d7ad33682e6dd…

MALICIOUS

PDF

76.2 KB Created: 2021-09-06 12:07:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0b3bd72d7d9b0fbaa257799870f12f41 SHA-1: 250374db2172aca2611dfd2927af333e65260dce SHA-256: e62d7ad33682e6dd317c9ad939f783ac90d2d5fc9ba5cdfe9738f8f4c7dee721
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, indicating a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://hkfew.org.hk/ckfinder/userfiles/files/wazosigaferada.pdf In PDF document text
    • http://przyrodnik-kujawy.eu/userfiles/file/xakusojujemuzavozoju.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b1a6bea9ec---vasozefozixenujuferatelut.pdfIn PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/numexame.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/ea8296b165004a2f33a13125fc647d18/91037743585.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a2ff8ad77---69136812700.pdfIn PDF document text
    • http://music-summer-courses.eu/upload/files/93526814800.pdfIn PDF document text
    • http://mail.teleserviciomalaga.com/ckfinder/userfiles/files/92324529564.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/8533349744.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b74de92464a---polulebisevowewu.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/kuzuxolaf.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/252558ae1bf73c4f3d6aeffd6578ca4c/32299233543.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/92e7ade490115bb4af5beead465d3ab1/tokuwavuzorov.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/3hn529v6vp3batmms5p7kjjmko/palifudanelifezu.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16129448b74f4a---kopugi.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/8a45791217691b539b8ecb13ccdda287/42997739892.pdfIn PDF document text
    • https://frigosztufi.ro/ckfinder/userfiles/files/51523113388.pdfIn PDF document text
    • https://mimpiindah88.com/contents/files/vojuduxit.pdfIn PDF document text
    • http://art-lan.ru/uploads/assets/file/97433179337.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/jabazogagunijepukatiku.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/5rkq8vdanp25e1ed97ign8t19m/jewefazitudejejo.pdfIn PDF document text
    • http://shriramashramps.org/userfiles/file/puvefom.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/57c5e2a967e4afe625370eafd2c48deb/bemegolovemumanolafiwojer.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=police+constable+circular+2019+pdf+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b0e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0E8 11400 bytes
SHA-256: adbd227943bc3c99287eb17c6eaa7c16457141ce888fffd48d248f1123572cda
font_01_sfnt_off0000cbd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD3 16352 bytes
SHA-256: 002206b88d26d4e98ed024f396d06a4995f1ea64dec2f3c06384c384b5bb893b
font_02_sfnt_off0000e23e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0000fa50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA50 15720 bytes
SHA-256: 7b7a3f28e83f074379ad990df914aa19679449cc9be083ad68a4a4585e1e8d3d

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