Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9b89caebda3fabd…

MALICIOUS

PDF

81.3 KB Created: 2021-09-01 18:09:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 42557890bca889e1483a403d83bc91e4 SHA-1: f16bf545a79c40b968353e215f9eb2e9d01b201f SHA-256: d9b89caebda3fabdcae9853e1a81af93bb9723c44dd174c3d2cdbf2aa7ed8216
172 Risk Score

Malware Insights

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

This PDF contains embedded JavaScript and multiple external links, some pointing to compromised WordPress upload directories, indicating an attempt to host and distribute malicious content. The presence of a visual download button further supports a lure-based attack pattern. ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a phishing or trojan distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://rebornfair.com/FileData/ckfinder/files/20210618_6960013F6B93AAD0.pdf In PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/getoxomaxopejevafiki.pdfIn PDF document text
    • https://biographiewerkstatt-singer.de/userfiles/file/zomolosujelobulurewulemu.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/96832433477.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/71402183259.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/81390196390.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/2aba87d2d43046f7c0d51c10f305cc30/51404472274.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/72873287458.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/81318104267.pdfIn PDF document text
    • http://svx.su/ffile/file/90686005587.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/69310159850.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210803_2830558CBFC64207.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/murawa.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/atp89nipnstq9e3gf14j6o2jsb/21049599888.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bda83d371b9---59823222398.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/jimebobevit.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/guxegunozop.pdfIn PDF document text
    • https://leuphuotcamap.com/uploads/image/files/15590446421.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160b6df65cec01---54766000638.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160fa6fc9e3428---73315495048.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/k7hcgjlnc9ger3o7q3fe91fhol/bokefotifuzugukutodidise.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/39f7673119b4a367e1c2c1c8e5b7244f/59562111309.pdfIn PDF document text
    • https://glearningsolutions.com/userfiles/files/36117971472.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=size+reduction+of+pdf+documentPDF 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_off0000d7da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DA 10640 bytes
SHA-256: a3ea4417afd842de35c61043616da825866ab2de27c79a6953eca8afefaf87db
font_01_sfnt_off0000f03a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03A 17784 bytes
SHA-256: 535f3b898cf7a823b46fa1bf263478bbd2019e8c98d8a6afb23e1fe5e1409809
font_02_sfnt_off00011e9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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