Malicious PDF — malware analysis report

Static analysis result for SHA-256 622e9315fe79d156…

MALICIOUS

PDF

83.4 KB Created: 2021-08-24 07:51:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4cd55e829028878488e4df4902fcf719 SHA-1: 32c6d43b176ba5e49f1dd93ec4487b7b146bbd68 SHA-256: 622e9315fe79d1565ad4535539042adb0c276ea8bf029de13817d366a4b9d90d
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to compromised WordPress uploads, indicating an attempt to trick users into downloading a malicious second-stage payload. The ML classifier and ClamAV detection strongly support its malicious nature. The embedded JavaScript likely facilitates the download and execution of further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abce5d239da---zaxemo.pdf In PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/37a8f465ab0f6f734f6e4f384744a346/wadukonikaxije.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/da6d38df17017c08acebb29bd5eefe95/ketapod.pdfIn PDF document text
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/bawuwaromi.pdfIn PDF document text
    • https://gencshow.com/upload/ckfinder/files/99604415908.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/minakanupar.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160834842cdb16---kijovebidaseraxib.pdfIn PDF document text
    • https://hotelgaric.com/upload/datoteke/tunoluxibemibojinixozo.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/bikalopu.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/168401316.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e4f24878a---favoranivepejakopofu.pdfIn PDF document text
    • http://labuchedeberce.fr/userfiles/file/neluruxotoresezo.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/zoxom.pdfIn PDF document text
    • http://ithaca1961.com/clients/875375/File/mowebega.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/25481300834.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/43558570473.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/bozuvebeg.pdfIn PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/33827519385.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c66beaac41---43227528431.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ff2e068a29f---32800334645.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/03qutj3i1pctbfakcci4ff47f6/surojuzin.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/funof.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091d6c660613---27162611286.pdfIn PDF document text
    • http://tageedesign.com/ssmpt/documents/file/wuxabomiginetu.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/lokapufasibigazix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=india+map+with+states+and+capitals+and+union+territories+pdfPDF 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_off0000ddb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C4 18552 bytes
SHA-256: dd89616375bd665999de1c5abb245851bd7ee21aa49fd9a03ea3d63c10754400
font_02_sfnt_off00012535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12535 11024 bytes
SHA-256: 4c13716c92b8051c9fdeababf2926438418d7564c08965a1a0aa7c385a1987af