Malicious PDF — malware analysis report

Static analysis result for SHA-256 228647fa68e91e49…

MALICIOUS

PDF

83.3 KB Created: 2021-09-03 11:15:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 81ecc6bb01461fc269857aff805ffb2d SHA-1: 60e0623747bde677e83d281a826fe18e81e449d4 SHA-256: 228647fa68e91e4917daa5d47cfb54ea173884b18ea046f64949102c9844837c
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of numerous external links strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://daming-school.com/userfiles/file/45780464356.pdf In PDF document text
    • https://congchung7.com/upload/file/24120076837.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/wexanururesepufowowi.pdfIn PDF document text
    • http://gabortech.comadmin/file/foteme.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/qimom813p0gp899bmsvac7l5u5/96679239865.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/lumomidar.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/53407755824.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9cd65a038---38930130977.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/j56ohkmkhfnq39ojfrvvec5b9n/fupegetatozol.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/k47bgbmlmglsbdcslgv52a333j/tejuwitanewa.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8396324ec---15252200548.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/316921c45c05a7d78b89fd61e57126fc/xamazefeposediwotolival.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/paxosadasufibelonulofo.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0aa9a48302---dagozulesetijuv.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c63d399ce0e---7759795861.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/55988295561.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/75302665446.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/vekituwexibo.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/59332923231.pdfIn PDF document text
    • https://fetogram.ir/images/upload/files/xifomewimarufulonemusadaj.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/cac801e6defe0478889e16cfc49f9c5c/jaxoduruf.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc803505d0a---31688651219.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/b5f2b973f4446004c194d82df93d7cf8/nigilunodibutejadesi.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16072a9534f343---liwewedijodibibewo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=intensive+and+extensive+properties+worksheet+with+answersPDF 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_off0000dd20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF537 10740 bytes
SHA-256: 911227831f865af768a2b4d2c0258d82d1f6940a252c078744bfd295e0a7e2b5
font_02_sfnt_off00010def.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DEF 18852 bytes
SHA-256: 9acfbbe6ad7f5c61be8e557258e70045ec245f0c08f2687fbad7117ca417f397

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