Malicious PDF — malware analysis report

Static analysis result for SHA-256 11d3f160bbea6cc7…

MALICIOUS

PDF

84.0 KB Created: 2021-07-03 01:48:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 95cbef2b6848f91a3c46cfa7f2bb20d9 SHA-1: a26af800e6b729f3afe08c27d20ca7182432103f SHA-256: 11d3f160bbea6cc75a9bdfac45d0600adcaed214164ad07cf5a809b3806b743b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to various websites, some of which are hosted on compromised CMS platforms. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics suggests an attempt to distribute malicious content or phish users through these links. No scripts were extracted from this sample, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://dalboncostruzioni.it/userfiles/files/80398782943.pdf In PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160debf071ead3---34956897513.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/76789068301.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/24536887633.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1fe278bec---21385619878.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bec964823b---62653803208.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b063be3df76---fesalabaziwizanokaruxatox.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/jujuxosoda.pdfIn PDF document text
    • http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/63734721436.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/bulegeji.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/ktqlsg1la0914ljn87i0l9ap2u/21078508292.pdfIn PDF document text
    • https://domilot.com/uploader/files/vilamuzoguratovowo.pdfIn PDF document text
    • https://yellowstonewildlife.com/mojule.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/gudamuvaroxevosedaxirufe.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/nadowuputisevegutalaziw.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c19a260da02---34042871798.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/75499f51a0d7bbf5826f3fdc7326539d/93633930169.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/91c907eca319de3dbc4fb21a096dbcb9/fekoxewezasap.pdfIn PDF document text
    • https://bem-sa.com/img/file/zevuratagefunekibit.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/9608b87c2e09a59149e0227fa33946aa/sekimewepizadoxajol.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/5862225911.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/8211746552.pdfIn PDF document text
    • https://t2sc.me/userfiles/81534410731.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3120a8d7f---46282898132.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/satenizi.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/qvhaiq15mf5g37ga4u36tuegpj/52899239950.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=watch+game+of+thronesPDF 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_off0000e4eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFD 17328 bytes
SHA-256: 8df774832991e21b65f9a39679f5410783008737335e6902644524adfdb5d371
font_02_sfnt_off00012a69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A69 10636 bytes
SHA-256: 09f54a99e50560ac7de375438dc4b583da04f327e558ff0bf236e58920074b80

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