Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9f67ce1dd610871…

MALICIOUS

PDF

87.7 KB Created: 2021-09-16 23:16:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1762693206f127c32562e9ea67b2f7c9 SHA-1: 67fdbfc49fc1ca548860f69b97d6bf3a2163a2ce SHA-256: b9f67ce1dd610871d44570f6f033bd65d9e7094691aa2506b695f64e3310f9d0
172 Risk Score

Malware Insights

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

The sample is a PDF document containing embedded JavaScript, which is a common technique for delivering malicious payloads or redirecting users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely attempts to download and execute a second-stage payload or redirect the user to a compromised website, as evidenced by the numerous external URIs pointing to potentially compromised or disposable hosting. The document body is heavily obfuscated and unreadable, providing no direct clues about its purpose beyond the technical indicators.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.emcp-pmce.ca/_includes/ckfinder/userfiles/files/zudebikitavozolonukusix.pdf In PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/domixuxuxomekujoxidulok.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/5684a2781d0747cbc3f76a2dea8e0a7a/jarelomizexubularu.pdfIn PDF document text
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/13844091162.pdfIn PDF document text
    • http://michael-dhom.com/webseiten/file/56478723463.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d2f8a6161---regakidusiwitunoxigo.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/mazotapofo.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/33640086992.pdfIn PDF document text
    • https://alhasooncorp.com/Files/files/pasifakudo.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/lasezupololanexazo.pdfIn PDF document text
    • http://baoveantam.org/upload/files/84540574039.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/ciija5841c3affgtqohsa1ahlr/jeror.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/57623288639.pdfIn PDF document text
    • http://szigmetal.hu/editor_up/fidipud.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612eadaa09f88---37373774421.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/kikuluvogaxubozusil.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16132769a6787e---42101870525.pdfIn PDF document text
    • https://projekt-lesen.de/userfiles/file/xireso.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/80447496933.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/76873881775.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16134407c5c844---lugeduloborijuxopudozodim.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130838eab780---29090697082.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/46245555449.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/47796404352.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/lalobasenikepolepok.pdfIn PDF document text
    • http://cuacuonnhanh.vn/Images_upload/files/lonavamuwixaximazom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=curriculum+framework+definitionPDF 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_off0000f26f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A81 17616 bytes
SHA-256: 69de5a3fe39e1c8280559ba78a6d5d6c75da2752452de5366c269b4e97bed59f
font_02_sfnt_off00013801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13801 10780 bytes
SHA-256: 3d72f90e3f908de19863806d8a266355fecc8e94812e3620a880f1ee442b9799

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