Malicious PDF — malware analysis report

Static analysis result for SHA-256 36767216d2e0a20a…

MALICIOUS

PDF

82.9 KB Created: 2021-09-18 00:17:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c2f4a422d328cdc5b545a7ee83de74e2 SHA-1: 09df2b4a6d515162cd5e09a2875c79529fc941b8 SHA-256: 36767216d2e0a20a42f963883e1772c22768745ae1d4fdbfbbf8a50e0444fc9a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or trojan delivery mechanism. The document contains a link farm pointing to multiple domains, some of which appear to be compromised or disposable hosting, suggesting an attempt to obscure the ultimate destination. The presence of a 'Password-protected archive handoff' heuristic indicates the document likely instructs the user to open a password-protected file, a common tactic to bypass gateway security. No scripts were extracted, but the PDF structure itself is leveraged for the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://galettedesrois.hu/userfiles/file/77593069506.pdf In PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/75216419917.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/27530479810.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/93640520051.pdfIn PDF document text
    • http://nt-module.ru/ckfinder/userfiles/files/45876973224.pdfIn PDF document text
    • http://yongchengtech.com/uploads/files/202109080726064185.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///lajekodekuxosizekep.pdfIn PDF document text
    • https://unitjaya.com/contents/files/53369053222.pdfIn PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/siwoxo.pdfIn PDF document text
    • http://nfc.soo.jp/file/33309448471.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613be4475b6c4---ladomevitofa.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/7009c134951d2683ba1cd2a046b37905/6447200942.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/pofexud.pdfIn PDF document text
    • http://rehahomecare.com/upload/editor/files/dosifudeg.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/xuwetugiradabekiri.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/ginoliwozuned.pdfIn PDF document text
    • http://pactolous.hu/upload/file/zafunefavanosipi.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/87770527206.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210903_58F32AF5D8F58CA4.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/xaloboba.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/53885612019.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/59624627983.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141bd959a23d---98709559483.pdfIn PDF document text
    • http://krcatikyonetimi.com/userfiles/file/limidatowinebab.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/43520483743.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=android+material+design+form+examplePDF 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_off0000da43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA43 19084 bytes
SHA-256: bab2220fcc659f8fd4cdd41e11e5eec349754c77fdc8227648eb3a423992af6c
font_01_sfnt_off00010cd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124EE 10924 bytes
SHA-256: be3b8107aec11707b6a5796e9818916c19ece98a5819ae32e82fcb6322976016

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