Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd6a430b4c9f658a…

MALICIOUS

PDF

79.0 KB Created: 2021-09-19 23:55:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: cfc91bd8bcc5b59a21d04b1ea11f56aa SHA-1: 62b6490793aaff4758cb3214e6c4d47233794dc6 SHA-256: cd6a430b4c9f658ae5fac361d3543d8d55e529707ef53150a39eb9186d9f4655
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting. ClamAV detected it as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The embedded JavaScript and link farm suggest an attempt to redirect users to malicious content or facilitate further downloads, aligning with phishing and malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/8f280da980725e23b9767993e6623e61/kedibutepewenamol.pdf In PDF document text
    • http://bisenzia.it/userfiles/files/fagiruwudulefuwi.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/peromelowekivexaxejitupuz.pdfIn PDF document text
    • http://lovesenergy.nl/file/11534406242.pdfIn PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/mojix.pdfIn PDF document text
    • http://modelseafarm.com/kweb/ckfinder/userfiles/files/18137409094.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/28229770564.pdfIn PDF document text
    • http://cloudinfo01.smartevolve.com/images/ckeditor/files/tujarovujimodul.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16132fbdb85b26---bewajobirovalesumozatif.pdfIn PDF document text
    • http://farmaciafasolis.eu/userfiles/files/30792109524.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/nuvutanoposaxirebu.pdfIn PDF document text
    • https://indiantiffin4me.com/nbloom/fckuploads/file/kukejupewatebu.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210904235219.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614222daaefc7---86012363135.pdfIn PDF document text
    • https://badanie-wody.pl/galeria/file/93720851504.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/gapexokizifiwu.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/domixuxuxomekujoxidulok.pdfIn PDF document text
    • http://runhouchem.com/upload/files/24252660676.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/lavuwekoruzupakugosux.pdfIn PDF document text
    • http://hp-cnc.de/uploads/files/xawozepez.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16144d22819f73---8921405001.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/rilexozadisezudila.pdfIn PDF document text
    • http://morecoredesign.com/images/imageUps/files/74353512555.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=aimbot+fortnite+ps4+downloadPDF 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_off0000cebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEBE 10944 bytes
SHA-256: f26614e157531cff24acd8d418da4cffb659f51dcc059c5c112177507959fa2e
font_01_sfnt_off0000e7f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F7 17712 bytes
SHA-256: 76f37d61a49964322f58c059af9902b8893a3631d1ca3ad64fd4a74400fea86b
font_02_sfnt_off0001164a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1164A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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