Malicious PDF — malware analysis report

Static analysis result for SHA-256 92a66701bc75b66d…

MALICIOUS

PDF

86.9 KB Created: 2021-09-05 19:16:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8081496865bf1b3e189cee803277afac SHA-1: db09504cb6955073622c5214a806b445161e156d SHA-256: 92a66701bc75b66dba80f61f61b5b677d7c905190ab0806b46f8715e137edaa5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on multiple compromised websites, directing users to download files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the presence of numerous links to potentially malicious PDFs on compromised domains suggests an attempt to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://mispuntossaga.com/campannas/file/taligexumadudujesulizexex.pdf In PDF document text
    • http://asesorgubernamental.com/images/file/27209103471.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/40183a941e6bef4d6984477ea66473ff/13267454041.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/30166422991.pdfIn PDF document text
    • https://cesiedizioni.com/userfiles/file/bixujuto.pdfIn PDF document text
    • http://unseretochter.ch/images/file/18181105844.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/65412440195.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/rodejov.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/vimufaloliwepiloz.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/u7jnv8drqbifsuchsneqn2h11f/14505284007.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160924eed5e212---wizesesizuz.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/1867459379.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160718d8e63a46---28615536020.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f54bd97609---maxiwijumetixi.pdfIn PDF document text
    • http://stattus.com/assets/file/fovaxaboxugala.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/wazokutimatujod.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/46445780463.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa871ab5243---jizemojiwujamiveda.pdfIn PDF document text
    • http://navrattan.co/userfiles/file/siniroter.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/4ff097ad24701e4f25e473b0cecf5e8a/mulumi.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/92865633583.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/6304151858.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/98857436808.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/kabubidezijatef.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/78c04d597a1a57c7bf9cb8b80835cd64/39536712107.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=casio+wk+3500+service+manualPDF 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_off0000e6ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AC 11096 bytes
SHA-256: 09652982710b93aa0822565faa7223052e16d7a95a19063328d0de7f8114862d
font_01_sfnt_off0001009f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B1 19948 bytes
SHA-256: 987cf639d3757462a0dea4ef56d8dab7a1765bb4843ab352ed9b57d8fc10806c