Malicious PDF — malware analysis report

Static analysis result for SHA-256 03626545ed6db806…

MALICIOUS

PDF

94.0 KB Created: 2021-06-12 09:03:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7aa97ac30266c11aff4cd4b6cd474cf SHA-1: 1c6864f18ddbe1a30187ab62cf9812bee8d46228 SHA-256: 03626545ed6db806ffd065d09550934ebc810fe1dbc2f3e7cb77b16d368a6231
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of a 'download button' heuristic further supports the intent to trick users into downloading malicious content. No scripts were extracted, but the overall structure and linked URLs indicate a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://queure.ru/uplcv?utm_term=doraemon+stand+by+me+eng+sub
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/a9629932c6ef5dc33db3067b40d716e9/55364559218.pdf
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/8f8c8acf6941f6ae77fd1aa3775dde34/25477648990.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/d4uvstd5gceb26e7cu61bl0i50/52775758099.pdf
    • https://tepihtrava.rs//files/durajujatopoxojijefe.pdf
    • https://go2germany.ru/files/file/pawowux.pdf
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/80058221967.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b3a1b2179---67051601366.pdf
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/d336e1da3b96533e89b1676c07682e83/tolenudizirisafebudi.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f203dbe88---dejevudeg.pdf
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987e38b302b---piwikezorofurejamosavoga.pdf
    • https://t2sc.me/userfiles/12005177139.pdf
    • https://olivierdaulte.com/ckfinder/userfiles/files/41537591706.pdf
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/0461b46d1c109193d8b9a8e93acfe7e9/72593661269.pdf
    • https://cristalensi.com/public/File/47670926090.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010101.bin
ff7043a75879f0c79b51f0b03cdb08fb8d78550efccea71092d33c2cc21f6589
pdf-font-stream PDF embedded font (sfnt) at offset 0x10101 2988 bytes
font_01_sfnt_off00010bb4.bin
08dfa0200f85c7c1e8d4f1b7e6fd504d59076da997645e047ae75a644e496825
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB4 5356 bytes
font_02_sfnt_off00011dd0.bin
51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD0 1800 bytes
font_03_sfnt_off0001265e.bin
724a8d605e31cff81e4bce83f80d0f0c0fddb57cee7fcb92701901a43407d120
pdf-font-stream PDF embedded font (sfnt) at offset 0x1265E 13724 bytes
font_04_sfnt_off00015369.bin
66d91a21c264a4eaf516740eb4b470d87dd0838895eb0a840ad7dc4a09f8687f
pdf-font-stream PDF embedded font (sfnt) at offset 0x15369 16364 bytes