Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f953848d31dc509…

MALICIOUS

PDF

98.4 KB Created: 2021-09-05 04:26:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c3403f6717411017b7f00e11dc37870b SHA-1: 4849ca5d1e5a037c53918c17b186b968ecefab24 SHA-256: 1f953848d31dc5097483202e4787b43f6907490ba22078fc1cadb303dd2ed508
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URLs and heuristics indicate it is a link farm, likely intended for phishing or to serve a malicious payload. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://allytemp.ru/uplcv?utm_term=les+march%C3%A9s+financiers+pdf PDF link annotation
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/88211635092.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/44768091696.pdfIn PDF document text
    • http://wish-pharma.com/upload/files/bumago.pdfIn PDF document text
    • http://batterseataxi.com/survey/userfiles/files/82519179017.pdfIn PDF document text
    • http://isleford.com/filespath/files/20210804221307.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1612b3b2f90af8---68974967657.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/timuxilalas.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/77f4c1ea18ceca28a51c87a2297b707e/rapilakeguzixaz.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/odaxawa.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/57705815609.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/253565d7c5b27aa7430bea791daf1031/71498080081.pdfIn PDF document text
    • https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/e885e5da3f694d2852cb898574eb4dc1/jeduzow.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/waximivamugugok.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bbea5488ff0---1912967852.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/mafamewakenifom.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/refebiwuwa.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/26470058740.pdfIn PDF document text
    • http://adveotec.com/img/file/68542402697.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/bb47694b57f00e77eb8607945f722e9f/sefunidajabuperisif.pdfIn PDF document text
    • https://forthepeoplegov.com/userfiles/file/kinububaxikawujujofagakan.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160881cdb805ec---91254428826.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/pamavuludaviluwip.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ef2ba4859---22016199808.pdfIn PDF document text
    • 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_off000110d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D5 22980 bytes
SHA-256: b12575086ad80ca2619e50ca41456505d3d71ff59177ff953d0c54d94d306b65
font_01_sfnt_off00014a47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A47 10732 bytes
SHA-256: 4d92926f0140e15c4ca8bd20f2e46fe4973da3f512a3e8cea9ff6c69d047d8e4
font_02_sfnt_off00016260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16260 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1