Malicious PDF — malware analysis report

Static analysis result for SHA-256 d68f720d1de6425a…

MALICIOUS

PDF

84.0 KB Created: 2021-09-07 22:16:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 0e070eae8f957ae89e76400d2a71fb30 SHA-1: 40e272465a55285c39db4d19388888abcb493231 SHA-256: d68f720d1de6425a98238470b00e9611dfd7f41f37afa501f61efa0f9e8c184b
216 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 an ML classifier indicated a high probability of maliciousness. The heuristics indicate the document uses lures to encourage user interaction, such as enabling macros or editing, and mentions password-protected archives, common tactics for delivering secondary payloads. The presence of multiple external URLs, some hosted on compromised WordPress sites, suggests a distribution mechanism for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/a8dc73334894b24ec64757487b9b9421/neverad.pdf In PDF document text
    • http://alves.bg/ckfinder/userfiles/files/dovafamuwinunozijofulanut.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/ruvixuzukijitumokogosuwop.pdfIn PDF document text
    • http://icoenergia.com/userfiles/files/4315192673.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/zafipurukob.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/386fa69b3a165afbcb4875b04e702c13/kujafezetukivonivuv.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/c06b32d4bb142966740399b1e93599b3/44512571732.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/burupozug.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613434aae9394---35083726071.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/33015846126.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b035a6587d4---tiriwuzinubirobowipivifip.pdfIn PDF document text
    • http://www.sosonomo.com/ckfinder/userfiles/files/logegutoropenumu.pdfIn PDF document text
    • http://scpt.it/userfiles/files/datizenexujetekisexomeked.pdfIn PDF document text
    • https://travelstore.tn/userfiles/file/65161872417.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/19713184419.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/jizadizabodijine.pdfIn PDF document text
    • http://mueblesdepladur.es/1/userfiles/file/xovutetogorumixoz.pdfIn PDF document text
    • http://hhs63.org/clients/8/88/88ec95b665b56da82b1de85f097fba10/File/4982314542.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/pinosatutapubejeluveri.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/65525281660986d6099d18.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/gumavijabiwitufebof.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/jegoropixe.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///40460799044.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/ffja16mvsbfvegdiqh3b1hrr96/tivukeregisufizukixose.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/278d7c7990d4bd3446a504d86e6b6040/nixitumakenigilomefe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=quitar+proteccion+pdf+protegido+onlinePDF 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_off0000e1df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F6 10784 bytes
SHA-256: f4f4a7c7885cfa6191835180bf943f902b2c166e1eb4ea61be9c713ce1ddc8b8
font_02_sfnt_off000112c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C0 18668 bytes
SHA-256: 2651d62446d4cb5a3d9cea553ecdb8d43eba6838e5a57ae0ced995cc4575d547

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