Malicious PDF — malware analysis report

Static analysis result for SHA-256 8142fb9ff5e7a6ee…

MALICIOUS

PDF

128.5 KB Created: 2021-08-03 01:51:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a44c567abb4ec3a0118d371732b4ff1e SHA-1: da594d7caf445dd5021ec225cd80911b28630316 SHA-256: 8142fb9ff5e7a6ee6d35c6dbdada596e4eb8e620449be7182cb0c9c1bec91b0f
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable domains, which are often used to host phishing pages or distribute further malware. The presence of these links suggests an attempt to lure users to malicious content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://studio45.live/wp-content/plugins/super-forms/uploads/php/files/9ivo6nbhtrgo8defa03501mruo/ditana.pdf In PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aff38b6820---28352157453.pdfIn PDF document text
    • http://air-ned.com/uploads/files/vejosulabob.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/bepoxukotopawofolizuz.pdfIn PDF document text
    • http://takeacode.net/user/d41d8cd98f00b204e9800998ecf8427e/file/guzibasojipafiw.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles//file/kuxivovibivevarinuxilud.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/98629069532.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16076b985e9a0a---puliwufosar.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/jemikatika.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8a092e271---862271392.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/8svg61btkivpghsjufv28d37il/zatazigaworitumuzewir.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/0afa9f062bbe51a3598bb6eef7f54b2b/mazesedeninuv.pdfIn PDF document text
    • http://mvclassof1990.com/clients/8/8c/8ca0ba2c7a07c5cd1f21f9fc323c16c5/File/midowiwesu.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b479557e2a9---38628739147.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/kuwurebadolapenivujurum.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/megulaz.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160ee000eaccd2---2520594923.pdfIn PDF document text
    • https://shibbirs.com/media/files/98567101415.pdfIn PDF document text
    • http://jonkmp.nl/img/cms/file/nusonawupiw.pdfIn PDF document text
    • http://aweibel.com/Photo/file/voxidefikotivulo.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/8n7ctl9bs8a4js2dvcd5rc9mok/46202680295.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/bedosusavirosojam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=excel+vba+copy+specific+columns+to+new+workbookPDF 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_off00018eb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18EB4 18648 bytes
SHA-256: d1f7ff9aea5dd3657af8e2189349fe630d4d5c6daa96ce80f1b56e9bdf6dca21
font_01_sfnt_off0001c05b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C05B 11324 bytes
SHA-256: 8ba1b9a644b65f0ffcf9976f6d6d5760ba66c58327be3d18769183894e97d00e
font_02_sfnt_off0001dae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DAE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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