Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9b961c64955eb21…

MALICIOUS

PDF

89.4 KB Created: 2021-06-29 05:00:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1a4327f6296e2fdd76ce1006e083f8ed SHA-1: b401c40c74919a72ac42692c896c3e9af5ad82d4 SHA-256: e9b961c64955eb21bc39832d86a1af21a6e223b31053c345a25e72c57af92e1f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress upload storage, suggesting it's used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and URL findings point to a phishing lure, likely attempting to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • 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://aimara-bg.com/userfiles/file/5818235735.pdf
    • https://aplusadvance.com/naver_editor/data/file/48859689640.pdf
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/408ha5uvrd84haifvdq2cdqsam/taneneratu.pdf
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/11427215621.pdf
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/j2p79kjqh29ktvbqrvl2m4332k/2530092556.pdf
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/77494adc421f4d1b11513002b5771faf/29131702885.pdf
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/75ecd08b3da978ed284cb8dae0c3d355/wenajawejewububuvusanuj.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16078d2723fe5a---43457558946.pdf
    • https://www.nuyew.academy/wp-content/plugins/super-forms/uploads/php/files/ce23175e480c68d8eb2235fa11cfc523/25505389588.pdf
    • https://mangmalungtea.com/userfiles/file/tenabigu.pdf
    • http://altelaw.com/uploads/image/file/kirujetosakobajif.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf6779f0b1---wabegadololovalo.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160732ca7c76a0---72847398776.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095ee8951dd2---luluxakufidefusofoto.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608335b6e9cdc---6100521940.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/9n1h0hkr97a72traim4sblkc4v/mogugolini.pdf
    • https://anjingliar.com/contents//files/bomasovebolepidirax.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079a89a27bdb---vedejit.pdf
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/0c9cd2131e5c7a4c5a133bd1db60a2ad/67115341071.pdf
    • https://medius.sk/userfiles/file/rinitira.pdf
    • http://onestudent.dk/userfiles/file/xilizexafoxalifatuw.pdf
    • https://alatheir.com/atheirwsfiles/file/supumoduragube.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776c98bea66---75090620096.pdf
    • http://alwaysfavorentertainment.com/clients/879371/File/15465565881.pdf
    • http://hillcresthigh1971.com/clients/9/9f/9fbf9047a6869172a982db6f42f05a9a/File/99466459052.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=cooking+fever+download+apk+for+pc
    • 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_off0000f4d6.bin
c97fa29160804b6cc5ff895a043361e00a6e4060412db530a38fca4c83af7087
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D6 10804 bytes
font_01_sfnt_off00010dc2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC2 16792 bytes
font_02_sfnt_off000125d4.bin
1a668aed4d8d0b0a279e300f12863d92b2a079854de007863fc37b32f99d3082
pdf-font-stream PDF embedded font (sfnt) at offset 0x125D4 19500 bytes