Malicious PDF — malware analysis report

Static analysis result for SHA-256 a45311531a6c4526…

MALICIOUS

PDF

91.3 KB Created: 2021-07-29 16:30:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 912e319e1b2c81f7c3707e2e32727eb5 SHA-1: 1908010c341c96c3dde76bd5fd0224f0ae66fcc4 SHA-256: a45311531a6c45261f567563d0dbd39ff52210dd9208d77116e860dc7086e257
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm hosted on multiple compromised websites, directing users to download files. The presence of numerous links and the ML classifier's high confidence score indicate a malicious intent to lure users into downloading potentially harmful content. ClamAV detection further confirms its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • 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.
  • 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://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b38d788139---27724290573.pdf In PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160827868aad36---18782870723.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/ff8b7fc86abbc466c4e8cae6466b14f8/77108258923.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/vlqm05rrvkptol2me3eeslti0q/gimob.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/lamorojofipa.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/32142888453.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16088eb54db571---vujopuzalewufawenal.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/sofadudazalalisax.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/61284756273.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/nulirok.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a848e927c8a---47540927934.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/97092273179.pdfIn PDF document text
    • http://womenscouncildallasarboretum.org/clients/85748/File/99173865649.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/05/18/file/20210518_062323_195.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/mlbct704qauhunqb4113n9bfsl/28895121914.pdfIn PDF document text
    • http://standdominica.org/files/files/dajevezepowakeb.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sewakodukimeniga.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///ropiwenexagazi.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/jaweguri.pdfIn PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/78694214655.pdfIn PDF document text
    • http://minipit.com/data/files/kibakogakakisu.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/gigiza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=kingdom+rush+vengeance+mod+apk+revdlPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8B 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_01_sfnt_off000100cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CC 17052 bytes
SHA-256: 622afea680d69bc8e93d3851d7ae52d12b9d0291fd6477a72ddfa952ec29d5b7
font_02_sfnt_off00012d4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14564 11112 bytes
SHA-256: 9dfffd7c662a3e7ea25ac98e4b42b61e577b8105db8f9a64cde930be4f66b0b5

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