Malicious PDF — malware analysis report

Static analysis result for SHA-256 97ec8d28a0d88aaf…

MALICIOUS

PDF

82.4 KB Created: 2021-09-07 06:56:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fad59109ce591d394b912cd6fb6dc721 SHA-1: acc52b9cae5ef0cc15a4591b23c7a5b8b258ba5a SHA-256: 97ec8d28a0d88aafb67b211250567f31b99599fc49ff6e90159c0e6a8f9a0151
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised WordPress sites. The ML classifier and ClamAV also identified it as malicious, likely a phishing or malware distribution lure. Although no scripts were explicitly extracted, the nature of the link farm suggests it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://wastran.ru/uplcv?utm_term=recursos+linguisticos+pdf PDF link annotation
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/0126abf7b9c29e28806b02372d3720c9/zitukubeduvijazej.pdfIn PDF document text
    • http://marymo.ru/uploads/files/lukerifukepegizizuwalepo.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/4tge5t2tlap5vucknt2fmrqdk3/33545577151.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/5b97b2d6ec3ed2e5a412e5bd087d504c/88362346627.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/7i1j2p77luicjs721apvoe66gp/66369623978.pdfIn PDF document text
    • https://kis-u.com/page_data/file/20210623140446.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/abab17291af69baacfe44cff0d9edea9/34333738445.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/6d6ea05380947dd6ae3f3a09f9373128/66260021257.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/makudu.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa090e563ab---dizetukolevatuveralato.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/8959217494.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/11563891084.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10903063532.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/51576085346.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/6a60fee14b07b7b39ad18bfd0e3e10a6/218456138.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/38538137862.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/ac36cc6355355be4379f2b108fdc1d6a/sasivekeviwor.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/43128091698.pdfIn PDF document text
    • https://moolans.com/uploads/files/15764762838.pdfIn PDF document text
    • http://storemisr.com/uploads/files/tenetuwijesa.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/nugizika.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/mofurigupumivoduba.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/834705869.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/73893776580.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16099d55e64263---lutojaxuzo.pdfIn PDF document text
    • https://globalathena.com/ckfinder/userfiles/files/44446638869.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_off0000db03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB03 10776 bytes
SHA-256: 020232916dffb9f415e6469bcbcbdfb4a70c800490cbbd3cddfa692c0fe3a74f
font_01_sfnt_off0000f3b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B9 19292 bytes
SHA-256: 9e569d0fa2bf425cd65bba0ab643ceb4f72b7f93b3eba2ed0c45feb5208b58d2
font_02_sfnt_off000123d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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