Malicious PDF — malware analysis report

Static analysis result for SHA-256 39c683def36ee620…

MALICIOUS

PDF

84.8 KB Created: 2021-06-27 00:19:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 60fcb358f2e080ff3ef5c1dee52faaf6 SHA-1: 4e69026eb11cd257b09033d34827bec0864912b7 SHA-256: 39c683def36ee62082abfde0103bd79c3cd2a33f55f768b3294828492e6375a3
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating it likely exploits vulnerabilities or contains malicious content. The heuristics reveal it functions as a link farm, directing users to multiple domains, some of which are hosted on compromised CMS uploads or disposable hosting. The embedded URLs suggest an attempt to lead users to external, potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://unseenadventure.com/userfiles/file/wururujaxituvipewev.pdf In PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c21f168b547---mokizolurizoxivamosifedu.pdfIn PDF document text
    • http://photou.cc//ckfinder/userfiles/files/zaluzukix.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4560ae1644---84667004209.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c120522a406---30488398248.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/ketod.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160d636c5b418d---bufitaginilipobazavobe.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/dusivobanazimepax.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/5c68e1181276eeb567f4f10227c67df0/luwagefelarunanamasiz.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/35b77c3e5979e646166fa5d13a038ccc/jidavimanosefirof.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/kubarafenasiwemaziz.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078ebb49cd35---63566562149.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/53184303294.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609842686c8c2---38265634389.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095f127b7fea---60163485955.pdfIn PDF document text
    • https://coatielectronica.com/files/45794088948.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c84bce522ef---dopokonemigupa.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099c2cf7a166---33143027289.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/6c5a1256405632f5ad4fc7559f89f397/kipubil.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b353e08d166---megegibumixofidapiweli.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/26795409427.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/gijig.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/14618770451.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16077d55b11d35---tolajagetipuxixazasuxazex.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/3rakqv7cu7ojbkvb28mujfisj7/xovejeweduvegaz.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb31fc8e70---pobivajobinovosaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=gin+and+bittersPDF 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_off0000e5bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BD 10256 bytes
SHA-256: ad14bc54cf13d09cb6ac73ab9bf7ae6062e08502523fd401cc8092536b6a4413
font_01_sfnt_off0000fce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE3 18012 bytes
SHA-256: 38d8c041475c20766ea8015c014efa7d02f3a20f7ce92a196a33a6c1b40c00c4
font_02_sfnt_off00012c8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1