Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e55c29354cbe99a…

MALICIOUS

PDF

93.6 KB Created: 2021-07-06 23:17:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: a70eb641a460c7189a7f7b4edcd9aaf1 SHA-1: b954ad7040f95dc66423b9b67acdbcbeb0b7fa0d SHA-256: 0e55c29354cbe99acd1a976f9409e5e8ddf8b60eef1e9e9841d854026fbc1c5b
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised WordPress sites, likely to host further malicious content or phishing pages. The presence of embedded URLs and the structure of the PDF suggest an attempt to exploit vulnerabilities or trick users into visiting dangerous sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16075a21650bcd---20818210555.pdf In PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c224d82ebd6---8990216242.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736c35b567a---62466473348.pdfIn PDF document text
    • http://livinglearningandworking.org/clients/e/e0/e05af8355f71d8da3aa90f500b9284b3/File/90619615069.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609e8a4872729---livugoxupe.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/63650709817.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609631520bca1---51795861916.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608916a6a9b84---najevopufafak.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/boparezovifuwux.pdfIn PDF document text
    • https://mides.vn/images/ckeditor/files/wojagasedu.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/cfca50b52c202b43b47505a823bdc8ad/71578893519.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/35597015600.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1c6dbb78c---kilaresad.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d38d3ed33b---63168781948.pdfIn PDF document text
    • https://denimder.org/resimler/files/wamuwafi.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/bapokex.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/4b5a8e3408e383de953e4965fdfc03fd/41029896522.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/kotajewerosoboxafuzinetus.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ebde7a9aad---titifudalomejojilaxo.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/434103e29ea49fbad789c6d9989c56d5/77106388464.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a3280061f---12756667642.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/3d44e1feb39ac704b5851b1ae99a426e/sesefamudumulijib.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc94e7c974---gexusi.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4b5fc10562---jedodozipuv.pdfIn PDF document text
    • https://realschoolspirit.net/scauserfiles/files/95447224217.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160867211ac2c9---jatidizerugimad.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/19123101366.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=dog+and+cat+grooming+near+mePDF 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_off00010d55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D55 16844 bytes
SHA-256: a9f4d1d41b7c075891181e269a24e8c289089bbb71fe8fddd863af7473f23700
font_01_sfnt_off00013930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13930 10500 bytes
SHA-256: a82ce993f738553428acab45455ba133e3118a1b40a8b005c3103c347af08712
font_02_sfnt_off000150d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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