Malicious PDF — malware analysis report

Static analysis result for SHA-256 aec074b94f57816a…

MALICIOUS

PDF

80.8 KB Created: 2021-09-20 13:50:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e49fc445fee61cba5d9ebd8e2671f9df SHA-1: 360d75a48987544871a3d4a6d6671c14a285b0e4 SHA-256: aec074b94f57816a3fa635705d614cfdb5ba5fd6f6b308590d354e829ab62878
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which are associated with compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic for SEO poisoning or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://laborke.ru/uplcv?utm_term=ten+sport+live+apk PDF link annotation
    • https://barcelona-health.com/files/galeria/files/nilulewiw.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/fabanubipekogakiduto.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/3a29e199be8f8d687ce964a2f2682374/lexibukulivijunadeluvi.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/gijanerozarir.pdfIn PDF document text
    • https://simpangkanan.com/contents/files/gejesesosafubele.pdfIn PDF document text
    • http://techbis.pl/files/file/segabuzaxim.pdfIn PDF document text
    • http://rebeccaosborne.com/uploads/gutepura.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/62347873929.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/katimekixadagizaj.pdfIn PDF document text
    • https://batdongsandothanh.vn/luutru/files/rixududevewo.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/161440538a8a42---44529939245.pdfIn PDF document text
    • http://www.yemany.com/yemfiles/files/4649420240.pdfIn PDF document text
    • http://sostrevalli.it/userfiles/files/fopojob.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210908052812.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/97846154697.pdfIn PDF document text
    • https://cardolf.ro/files/81313963456.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/lanuwu.pdfIn PDF document text
    • http://emeat.ru/var/files/vomitabaromopodidimurigud.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/felenaderuwowo.pdfIn PDF document text
    • http://belv.ru/userfiles/file/10836577022.pdfIn PDF document text
    • http://whatifitspossible.com/ckfinder/userfiles/files/67862786369.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161445075794db---16787385742.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/befefezagurojinadape.pdfIn PDF document text
    • http://imi.vc/upload/files/japemagipisa.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/37876434644.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_off0000d863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD863 10364 bytes
SHA-256: a3780fc0ad3b4cc160f1aa075ebf56269b4c9dc99677db5a37f89a9b22550c8a
font_01_sfnt_off0000effa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFA 17712 bytes
SHA-256: d48e629cc3055a1aef0f5b2cde8daab98e6f9c01bd04bd87ce868e4ca2bda628
font_02_sfnt_off00011dba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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