Malicious PDF — malware analysis report

Static analysis result for SHA-256 56683324637e5dfc…

MALICIOUS

PDF

72.4 KB Created: 2021-09-12 19:57:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: b28df8ed441331b7eec3a304b0a7071e SHA-1: 3468bf8bedb8216cb3a8d15cf49708b4451d1944 SHA-256: 56683324637e5dfc0921fb8cc9a0cc7fcd44d2f33b33d03be91bc4a9a63899d8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a phishing or trojan payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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
  • 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.
  • 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://garglob.ru/uplcv?utm_term=charlie+y+la+fabrica+de+chocolate+libro+pdf PDF link annotation
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/44356dcaca895d780f523b0e1bc2e832/61962272553.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/xepujanuxaz.pdfIn PDF document text
    • https://bizimpin.com/calisma2/files/uploads/nuwipoj.pdfIn PDF document text
    • https://chorland-dining.com/webroot/editor-uploads/files/29008083205.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/763290062.pdfIn PDF document text
    • http://acelybio.com/upload/files/41881406768.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/71947003002.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021090416350073499.pdfIn PDF document text
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/30963769192.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nuwotejipib.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134aaa922a52---89799577664.pdfIn PDF document text
    • https://sistemagestiondpr.com/userfiles/file/wejajiwodutalerekafife.pdfIn PDF document text
    • http://factory-01.com/js/upload/files/26526578095.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/mamuloginunewagetepavalas.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/xetapugemedixabarotuboma.pdfIn PDF document text
    • http://gartenmessebau.de/uploads/files/xozixovegepij.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/faxuli.pdfIn PDF document text
    • http://topbuild.net/content/xuploadimages/file/jigoxuzevad.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364c008b038---56349540304.pdfIn PDF document text
    • http://demo-enriquemora.shopcloud.es/ckfinder/userfiles/files/punuzesupuludasar.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/rudibelujomuzowa.pdfIn PDF document text
    • http://susasoft.com/upload/userfiles/files/wiwobamevebinugig.pdfIn PDF document text
    • 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_off0000b641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB641 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE58 10728 bytes
SHA-256: ec11bba2e1d396dc0d3dc8551a9f9313d33afa5063a6b5695512b226ef6c2785
font_02_sfnt_off0000e6e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E6 17888 bytes
SHA-256: 2cbc4d90bcfef84876a1aee6332f177217c597dc23cf70a132b19299d95e69ae

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