Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac945686dff8512e…

MALICIOUS

PDF

80.8 KB Created: 2021-09-17 11:52:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0a45ab71d64434f220e3ca418b1e7c1a SHA-1: 09bb7bccafb443da1123df1b83d59c0d7ac56800 SHA-256: ac945686dff8512e4bffb0d9a3795b095c77d9778fe1ea3eb8bbd4ef527e6636
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or SEO manipulation scheme. The embedded URLs, such as http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161442cd5bf256---59017244638.pdf, are likely part of this malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://ecotranslation.ca/upload/editor/file/87664945873.pdf In PDF document text
    • https://bengalroys.com/ckfinder/userfiles/files/86833243404.pdfIn PDF document text
    • https://rumusjitu.com/contents/files/gutabiwofabuxijosorabe.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/l8d7g21971o4vico7g2srmhth4/nefokugipunaguferuxinis.pdfIn PDF document text
    • http://tchid.net/userfiles/file/80998054438.pdfIn PDF document text
    • http://rund-sro.cz/UserFiles/File/29086976479.pdfIn PDF document text
    • https://krzczonowice.pl/gfx/file/86815184743.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/793tgj2lo2maac1mk7km7krbh3/82606023603.pdfIn PDF document text
    • https://phr4u.com/files/marolofu.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/86763843270.pdfIn PDF document text
    • https://eklyps.net/images/file/lopokezu.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161442cd5bf256---59017244638.pdfIn PDF document text
    • http://datcat.vn/2018/file/647693869.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/36922693647.pdfIn PDF document text
    • http://ledins.lv/cms/file/10942491597.pdfIn PDF document text
    • http://canshu.dlzj.net/upload/files/20210903143230714836.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/8013267156.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/lazixusuri.pdfIn PDF document text
    • http://printrun.nl/userfiles/files/12807160120.pdfIn PDF document text
    • https://vivaldiroberto.com/img/files/mediafiles/file/78648827767.pdfIn PDF document text
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/76926120325.pdfIn PDF document text
    • https://hoangmailogistics.com/asset/site/files/bujoxekupapefakari.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/78782071293.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/fotisolaxuzi.pdfIn PDF document text
    • http://charivne.info/images/file/mepupigibuvile.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/pigibarexegojivove.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/mamuresoxozubuzamawusem.pdfIn PDF document text
    • https://ssvacancy.com/ckfinder/userfiles/files/47327884496.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+to+delete+firmware+from+androidPDF 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_off0000d773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD773 10424 bytes
SHA-256: 9513124abb586c704ef966f56a1ad9718317df49db06dfd7ef0b289163fa9941
font_01_sfnt_off0000ef09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001071b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071B 17840 bytes
SHA-256: e2f5be70e814e98bb3dbd2717ace47865fe3da949de557f4458e52d75c98b30d

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