Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad71ed2f75d3314e…

MALICIOUS

PDF

72.0 KB Created: 2021-09-02 17:23:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f5c730b7e54fb46ee2258e78fa34cc10 SHA-1: 5c88c461e3436b0917f874284a2388fbf7b5b28d SHA-256: ad71ed2f75d3314e004fa110d50629d386226bfd17023fe464ef783f3df27e97
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links to external URLs, many of which point to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lead the user to a phishing site or download a secondary payload. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://degrossier.nl/uploads/file/33260155722.pdf In PDF document text
    • http://beveragesgs.com/userfiles/file/tumevelirara.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1610891593314d---jonin.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210701143717.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/totujupoxodomarenizoxek.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210808162428.pdfIn PDF document text
    • https://abouelhoulgroup.com/userfiles/files/50582157446.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/noxukirulesarupuzuba.pdfIn PDF document text
    • http://bluelakehomestay.com/uploads/image/files/badovuwa.pdfIn PDF document text
    • https://edusfera.pl/upload/file/38471515255.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/7455475268.pdfIn PDF document text
    • https://digireg.it/upload/gekow.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/abr0nisdbr4vu7u78i8jmcb4h4/14368707968.pdfIn PDF document text
    • http://teknis.it/userfiles/files/85658166147.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/11272799809.pdfIn PDF document text
    • http://soloparamideco.com/js/new/fckeditor/userfiles/file/1687939599.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16072a4769dc2b---nunaneb.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/f734e48f263d39067c62e592c89a45ee/xuwakidabafexe.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad81c19cd3f---82744548327.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/65872767244.pdfIn PDF document text
    • http://delfosventures.net/userfiles/files/tifuvatakafujiwex.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/zegixapajulutopuseketap.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/62930891346.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=leviton+d4dmx+dimmer+pack+manualPDF 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_off0000b82a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB82A 15976 bytes
SHA-256: ff64ed690a741e3e104e89ef241fd2baa4fa8180235a8cad880055b9cac17329
font_01_sfnt_off0000e13f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF956 10904 bytes
SHA-256: 5fe128980486e8faa87f8e80dd6aa8d4c13296a94e0d7a38d0d74b8c8299a7ef

Open this report in the interactive analyzer, or submit your own file for analysis.