Malicious PDF — malware analysis report

Static analysis result for SHA-256 77eb407a44904572…

MALICIOUS

PDF

85.6 KB Created: 2021-09-12 18:06:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0067b0a2793d0ff8f0275584204b2952 SHA-1: 7dc056c754c6d1aa3686f51f941735b76a529e79 SHA-256: 77eb407a44904572150236afea2aa2ca2dfc5b1d8175448eaf27b263cb28c57d
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains a link farm pointing to multiple compromised WordPress sites and disposable domains, suggesting an attempt to redirect users to malicious content. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://permanentnimakeup-brno.cz/userfiles/files/feganule.pdf In PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321a91944a9---92465922652.pdfIn PDF document text
    • https://kawanmto.net/contents/files/vijab.pdfIn PDF document text
    • https://vidaleve.net/ckfinder/userfiles/files/pibivewixubadelow.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/jowebupesofofon.pdfIn PDF document text
    • http://vipnovini.bg/root/f/uploads/files/givaso.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/94524766253.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/46120134898.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613607749dce7---dozewezuvupubezugej.pdfIn PDF document text
    • http://yarpb.ru/pic/userfile/bivom.pdfIn PDF document text
    • http://tehla.eu/userfiles/file/bizomokimezaseta.pdfIn PDF document text
    • http://15881588.com/ckupload/files/11407214728.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210906_165040.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/rixozev.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-09-09/images/files/3869779669.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/gudepadefato.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/19741634666.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/7522998273.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/75771029473.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/kavalirunipugokemituseb.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16131a9b0070e6---81349359089.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/kalimasexefikogufudezix.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/vifepajubelolobatawo.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sixabiwopiwexuvoxol.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/pugafanuvinatefo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=javascript+android+app+developmentPDF 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_off0000ea66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA66 10732 bytes
SHA-256: 58de92724a8a0c1f4e46022d716289d4b1c1a369e606748fbfbfcc636e4af32e
font_01_sfnt_off00010306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10306 17496 bytes
SHA-256: b74b162c57ddb72b86d5a965a461389539bc8f42f5bb12eeb9657c7175dbdc4d
font_02_sfnt_off00013053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13053 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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