Malicious PDF — malware analysis report

Static analysis result for SHA-256 c53dc0170082c109…

MALICIOUS

PDF

84.3 KB Created: 2021-06-25 22:49:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 802e5f815a210418a1b20d1f97174c19 SHA-1: 9313f53308724255510c7cb1230c5bf37ce9de26 SHA-256: c53dc0170082c10950ddf613ceefe18f2ef16c35583d44cf3789e0846a2a3a34
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of multiple external URIs and compromised CMS upload links indicates a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/b633efc9996abf77244bb175ea9377f9/45320871420.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a108797b5de---36042864526.pdf
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/rigan.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609435dab2543---30953870029.pdf
    • http://teaandtiarasottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/3508519045.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e0c391490---pejixasofinujebuwevilog.pdf
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/4518f78eb17c767bcecf6d7f60a98d59/zijem.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160879df054f34---32860430995.pdf
    • http://forter.vn/hinhanh/file/famewawufuvajiti.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dcc66856d2---tafufuze.pdf
    • http://pestcontroluttara.com/ck/upload/files/rumurufaza.pdf
    • http://midel.me/userfiles/file/44084029690.pdf
    • http://aj-logistics.com/stock/userfiles/file/55939422988.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b84d3fc6f---zufenexedifikunivujuwax.pdf
    • http://learningkey.org/userfiles/49173704669.pdf
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/65f400qnnr16m6t720tk377200/83005661534.pdf
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/0d24abcc4f319b32b8b68058e23b13ed/61360951597.pdf
    • http://noithatdangcap.vn/app/webroot/uploads/files/tafopufitatubumina.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=do+forget+me+nots+spread
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e722.bin
b21dbe1dda06d4b587919ab8a172bbc01e7e50b836357fe1c86787bf172bc5c2
pdf-font-stream PDF embedded font (sfnt) at offset 0xE722 10704 bytes
font_01_sfnt_off0000ff7a.bin
b5aa65e45128d0c72a413ad11389883e7e8ff8a16c02c01b14bd4407d5933a7f
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7A 17176 bytes
font_02_sfnt_off00012c83.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C83 16792 bytes