Malicious PDF — malware analysis report

Static analysis result for SHA-256 21aa9d706b1a82ef…

MALICIOUS

PDF

88.1 KB Created: 2021-07-06 15:44:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 39a37142d62aea24fed2382e97af3ba6 SHA-1: 7444bede298d73241c59d7937d4c693eaaff4a55 SHA-256: 21aa9d706b1a82ef041e48a5e114bdbf782cc4e80311106f0162dc01854f9f24
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File T1027 Obfuscated Files or Information

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains a link farm pointing to compromised WordPress sites, suggesting it's part of a phishing or malware distribution campaign. The document also instructs the user to disable security software and provides password instructions for an archive, indicating a likely attempt to bypass security controls and deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16098a9fddfad1---15000852904.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/18tu0ek93dabpfn1i2ah1rfcvc/18931430344.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/13e50b6bca528a84722c19202c6e9301/54291866261.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160c9127dd7e7a---59985676195.pdf
    • https://pathakpharma.in/singhania/downloads/file/gusogujineguz.pdf
    • http://rld-carbon.ru/file/81408575043.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2449641862---13163091065.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad6b8d7d96---pulovenafikatorob.pdf
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/0c5c3d3730292b1d37fa39125b7b44d7/mezegatug.pdf
    • https://jodhpurtravels.com/nbloom/fckuploads/file/18699116373.pdf
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e36b38de64---tatopo.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160834930ec1f6---duworu.pdf
    • https://kingcarmotorista.net/uploads/files/9388383715.pdf
    • https://moto-trend.cz/public/files/fck/file/5340515804.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ac26c25e8---popogadulokitadez.pdf
    • http://ajtoablakcentrum.com/_user/file/43701159965.pdf
    • http://aimic.com/userfiles/file/34966318453.pdf
    • http://selfmadefilms.nl/userfiles/files/togewidona.pdf
    • http://nuovartea.eu/userfiles/files/tatizuzakimapek.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855ef29b12e---voborudopamitu.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c74ff82445f---tokiwenedonawelowawojet.pdf
    • https://actaviaserica.org/board/file/files/nibujiwuponozivi.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af838c9a508---boxezakowofegef.pdf
    • http://dobrasekacka.cz/userfiles/file/72115325558.pdf
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5012f3b2a---70196967412.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=remove+pattern+screen+lock+android
    • 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_off0000f161.bin
0bc599d0f3568f71a888a66f805367db798e2df86c289dc0b5d937405244c7c7
pdf-font-stream PDF embedded font (sfnt) at offset 0xF161 10880 bytes
font_01_sfnt_off00010a88.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A88 16792 bytes
font_02_sfnt_off0001229a.bin
95225cc6f1cf64c9fd080d73175ee5bb64fab2aef8b495c9aed48d45a6219a54
pdf-font-stream PDF embedded font (sfnt) at offset 0x1229A 19128 bytes