Malicious PDF — malware analysis report

Static analysis result for SHA-256 8eb93ee9e2907214…

MALICIOUS

PDF

84.8 KB Created: 2021-09-18 01:12:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e53cc364ed1b6036cd3ff1f1f56e01bd SHA-1: a62cd27e1557a49689839fddec1331986167e4e5 SHA-256: 8eb93ee9e2907214ef4face25a7f3c1355e95f2747546e30c43e8eeba9db8c7d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to various domains, some of which are hosted on compromised CMS uploads or disposable hosting. The presence of 'utm_term=app+lock+download+free' suggests a lure for potentially unwanted applications or malware disguised as legitimate software. No scripts were extracted, but the overall structure points to a phishing attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://sikahaiphong.com/images/news/files/51288378091.pdf In PDF document text
    • http://pololanna.com/user_img/files/14537279074.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/2f985eddadea6bf39d3f74c99292e89b/gezodiwepoxonimabuzefe.pdfIn PDF document text
    • https://learnrkbin.jugalbandiresearch.com/ckfinder/userfiles/files/vuxifuvumakok.pdfIn PDF document text
    • https://valenciamaids.com/userfiles/files/46965374388.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/8f0719f16a05fc0f3d75a381bec8b3f2/mopeso.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/75265211847.pdfIn PDF document text
    • https://adci.vn/data/upload/file/7372425504.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/botodamapebapip.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/35472068237.pdfIn PDF document text
    • http://roocenter.ru/upload/file/mewid.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16143a380d31df---49462321925.pdfIn PDF document text
    • http://naphogacomposite.com/upload/files/befarikerusomezititojidug.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/86169917384.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/soxewunolavikovu.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/lulaxudapub.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/katimekixadagizaj.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/japadirujixixifo.pdfIn PDF document text
    • http://bojovesporty.cz/userfiles/file/15385288358.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/tikadebedirawa.pdfIn PDF document text
    • http://www.pratikchoudhury.com/fckimages/file/92462177547.pdfIn PDF document text
    • http://119pump.net/d/files/90110778208.pdfIn PDF document text
    • http://xinxinhouseware.com/uploadfile/files/bologotezuzuwarusoxajo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=app+lock+download+freePDF 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_off0000e3ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFF 18636 bytes
SHA-256: daa68d22dd2c0b08cd136c95cb06457467cbf415ff0877a4ead949669575607e
font_02_sfnt_off00012cb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB4 10412 bytes
SHA-256: 19281269c78e775b3963f4104495fc009c3095a2351cd9a5d3388f274485f4cc

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