Malicious PDF — malware analysis report

Static analysis result for SHA-256 620d01f539c77325…

MALICIOUS

PDF

78.3 KB Created: 2021-09-16 18:51:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ea2f0590b2101d92efdd055752a76bd9 SHA-1: 0c8e6b601bb0032917dce3ec79b0f8ae248a76da SHA-256: 620d01f539c77325f49354f89854cf66b946b8c94bfcaf87bf356a42544070c6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to malicious content or the download of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • 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://chcial.ru/uplcv?utm_term=u2+songbook+pdf PDF link annotation
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/f4d8242e66278d199505328e4a619b42/24164596527.pdfIn PDF document text
    • https://gionggiacam.gagiongvitgiong.com/ckfinder/userfiles/files/51936226589.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-9-15/20210915202620389220.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614002f9584bc---39185261961.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/sajiwigeg.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/64332467521.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/fodumisixaxi.pdfIn PDF document text
    • http://dc-42351dc5a6b3.prshots.es/uploads/userfiles/1630713287/files/bevekepikisalawovorebapu.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/83264b68951850aecc755b7892af0554/vaxikovekibeliwogoxebejo.pdfIn PDF document text
    • http://mweb.cz/images/file/90124218431.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/mewakowugaxuvobumof.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/dinasenugavokunudutu.pdfIn PDF document text
    • https://otoform.com/upload/ckfinder/files/zogosuvimitufivipawatowi.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/5a0h5j3hb4puosil1rkgl1a5e1/vevojunifo.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/10296667331.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/76805291059.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/88395949806.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/29015209179.pdfIn PDF document text
    • http://nenkin-t.com/upload_img/ck/files/22739630460.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/eosc78m84339u3m93onou2lp77/24110925288.pdfIn PDF document text
    • https://matratva.in/userfiles/file/vujutezuzuzenolibasobolo.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_off0000ccce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCCE 10400 bytes
SHA-256: 3e5886ce437aae51ca487337b949f9a002c9cbe959fd3a44a19acc3ab0bb8ee1
font_01_sfnt_off0000e412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE412 18180 bytes
SHA-256: 67eebe4331941811eddf739541c9ff11d4279280a4a539e568906cb902f8e2fe
font_02_sfnt_off000113ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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