Malicious PDF — malware analysis report

Static analysis result for SHA-256 cae7ea5cde634723…

MALICIOUS

PDF

76.9 KB Created: 2021-09-07 15:54:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fd5a7a8c4a306d7c749db62ce71c13a0 SHA-1: d45da1376347d6e05a2738f31e845cc89ad7a84d SHA-256: cae7ea5cde63472313108723b8b56e51ca1b8decd1053609c3b099a28ad8200f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to compromised websites, many of which are hosted on WordPress installations and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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 http://worldcar.jp/userfiles/files/nagixasutunilevifebadej.pdf In PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086fcd13e608---71040601423.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c9cc201be---bazufobekep.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea4c3272e2---96079006328.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089be9c0d937---70690937624.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/75816696327.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021062009142631.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/pubumagurixavuguvedal.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/59286378521.pdfIn PDF document text
    • https://itexpertdog.com/upload/files/78526453485.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/2aa23f82bf5872ded86d6e7911bc2dbd/ditekonugosonokodobozeku.pdfIn PDF document text
    • http://fairway.cc/images/blog//file/wuxoxatopew.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/stpd0a2njfnnai6424gq76nd86/genanenumolovexula.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/3tseu3plbg6qki3imrrvva647q/72722939863.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/es7ae6ipsii9iv3kpgt1n77l55/namamarubigorajazo.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160f0c1775584f---vuzofoduvobaposaro.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/29002002696.pdfIn PDF document text
    • https://agriplan-rs.com/dados/ckfinder/files/lavadisalofonesam.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/luriguwaporazenupusibux.pdfIn PDF document text
    • http://halmar.info/userfiles/file/20073384130.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/65204d175e49f88dc3ded958f6c70ea3/doxemizidazus.pdfIn PDF document text
    • http://balone.net/_upload/file///kukanifijejo.pdfIn PDF document text
    • https://polymadeniyaglar.com/fckeditor/userfiles/file/7393266430.pdfIn PDF document text
    • http://greenmodels.ru/uploads/files/poxogewozanididetodalapu.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/5e839829e2dee701b078283ac6aeb8d7/bisazemafam.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/lewixisokezapilufas.pdfIn PDF document text
    • https://medius.sk/userfiles/file/78236763151.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=the+economist+free+pdf+download+2018PDF 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_off0000c209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC209 11436 bytes
SHA-256: bee516a931a58f4d449d478e456468e458d69515681c94d2d1adcc8eaec47e73
font_01_sfnt_off0000dcf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF5 18428 bytes
SHA-256: d1bc441cff5b76fbc6260694dd70261df233f1ce713282e63a700affac8c6658
font_02_sfnt_off00010d32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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