Malicious PDF — malware analysis report

Static analysis result for SHA-256 305a1514182ca1f9…

MALICIOUS

PDF

87.1 KB Created: 2021-08-19 10:48:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 79ab8645738247f468b44d0db23a048c SHA-1: 110c2bcaface1a30ea1abcf89cf0c6dc35700843 SHA-256: 305a1514182ca1f9422ded826876fc0e40c522885f6f2858012947e977c0f053
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The PDF contains numerous links to compromised WordPress upload storage and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. No scripts were extracted, but the presence of external URIs and the overall heuristic profile points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0eff73ffb---wutizulajazesoweluxi.pdf In PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160748cc30de70---wukigumuzudejuveripifo.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3c22d141cf---baliwelizotixif.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/sotevejafowozefaba.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/92750022959.pdfIn PDF document text
    • https://gullyracing.it/admin/ckfinder/userfiles/files/fisekuvogebivema.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/45487639952.pdfIn PDF document text
    • http://pmmagic.vn/userfiles/file/40514396088.pdfIn PDF document text
    • http://meyanko.com/userfiles/file///24718815359.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/3062766d8dc861aeb2deb5a9a2d0b5b1/85281606366.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/7f6865299c27a069656e5020d084352e/gapawapemanadimimiru.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160700f240abe7---fuxagoneremip.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070edd6c8acb---sibujefesiwe.pdfIn PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/dirumobe.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/bemakufog.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/25vd6g7tqtdi0bkn6m11drk3l1/zesasafaxebeziv.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d75241a4b---makotuwuruwepazopudole.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/51665256986.pdfIn PDF document text
    • http://kavernoklub.com/campannas/file/1270690250.pdfIn PDF document text
    • http://theprojectmanagement.guru/cote_dor_import/admin/ckfinder/userfiles/files/gosepawised.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/41948126003.pdfIn PDF document text
    • http://www.de.ruben.pl/ckfinder/userfiles/files/nututufepukupajadeto.pdfIn PDF document text
    • https://asiajitu.com/contents//files/15455099107.pdfIn PDF document text
    • http://www.bash.cl/media/file/wakovifanen.pdfIn PDF document text
    • https://jagamimpi.net/contents//files/63552290136.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+to+do+forex+trading+in+south+africa+pdfPDF 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_off0000ece8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE8 11132 bytes
SHA-256: 99c84d82843372e2a4946d48b8309cdaad57e3b049a0b8d6775bdd05b2fa93d9
font_01_sfnt_off000106b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B2 17032 bytes
SHA-256: ee486d1437be1c5c3ec5d3ac21a2ab42ca99d9eb6c21a48bd2df2b4e206a4748
font_02_sfnt_off00013382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13382 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1