Malicious PDF — malware analysis report

Static analysis result for SHA-256 8926d7814fcdb46f…

MALICIOUS

PDF

85.7 KB Created: 2021-08-26 18:06:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 73d6cdbd060760f86d6d5fe3d04e66c0 SHA-1: 447ba1fd9a828349d1196a7f8049be91c13f8787 SHA-256: 8926d7814fcdb46f7c6c341a1cac50a289e091b5d56d1f3d93d24fba4e4cdb75
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many of which point to compromised WordPress upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The primary attack pattern observed is the use of a link farm within a PDF document to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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.
  • 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://eviljoy.com/UserFiles/File/tafixime.pdf In PDF document text
    • https://atvatextile.com/upload/ckfinder/files/60354068975.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160832e6cae811---79688634299.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/68e3020ba8a17b0f3c093ceb4d831d42/95040415056.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/81815365025.pdfIn PDF document text
    • http://jucal.es/images/file/53236818916.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/72801254965.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/wuvesegukuxeno.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2b9095f23---powalemujukaxenowaki.pdfIn PDF document text
    • https://faprosid.com/file/lorelufamelifowinole.pdfIn PDF document text
    • http://azstorestudio.com/uploads/files/4869883190.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090fd0b1a3ff---sefokogabafobulumufeve.pdfIn PDF document text
    • http://fotossc.pl/_files/file/rovidekikokevotilalozamef.pdfIn PDF document text
    • http://scro.ru/pic/file/32066616788.pdfIn PDF document text
    • https://danielfelber.ch/userfiles/file/liwakan.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/c7gfvuhvteqnkoild6rpjpa2np/nunivebawesativufuvoxede.pdfIn PDF document text
    • https://digicpictures.com/downloads/99333935496.pdfIn PDF document text
    • http://getem.eu/files/file/tisixigobazidajazoju.pdfIn PDF document text
    • https://canoe.ro/Extras/ckfinder/userfiles/files/tofodirebipaxowusapoluri.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da91c60d8d0---36001826226.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/0caedc1ee33facda9240d0c9a4e9e027/sefusurebajerexojiweb.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/f4d4d3351672cc442385d619f450236c/wexidejupulipuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=ham+and+bean+soup+with+canned+beansPDF 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_off0000eaf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10307 17244 bytes
SHA-256: 27707f04a42613114d744e07d7cc614cbce766c1250be0dc122021bef4b0a554
font_02_sfnt_off00012fe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE2 10952 bytes
SHA-256: 77dcef92ec3686b0b7dc4e30dc73b5e42b167763a807702ca4cc729df0be0d6b

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