Malicious PDF — malware analysis report

Static analysis result for SHA-256 16d3de32b9681a24…

MALICIOUS

PDF

77.7 KB Created: 2021-06-20 19:59:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: e8d55aa98e19c5702e58b7212709185b SHA-1: 7325c9707462baeee6fce52ce84b846017452e18 SHA-256: 16d3de32b9681a24089914ccbb6e3ca83517c7702e5e626dbd8e2e5d93465356
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to compromised WordPress upload storage and disposable hosting, suggesting a link farm designed to distribute malware. The presence of a 'download' button lure and ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent. The document body, though heavily corrupted, contains text related to movie downloads, aligning with a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • 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.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8882d27c12---82936477080.pdf In PDF document text
    • http://sinproval.it/userfiles/files/13830949991.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/sarabovol.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094318aa754a---jikejasobipesudagu.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/22600208554.pdfIn PDF document text
    • http://simpli.ie/survey/userfiles/files/keditenebotavuz.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/i9dc0bvjo6dachge1p16ekcmvl/63400147457.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e6de46ef5---livoxibalutafapi.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/tafiweworuwube.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba9c256ab47---44422052691.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/tukafutivirubu.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/11609771124.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/ae02d0319548ad4945bba252529789f2/8134107352.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/90252723048.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f2fa3d9ae---82752039443.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/3e3282f86189d7a24c5a613b2cd6f7da/fujiluja.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=punjab+nahi+jaungi+full+movie+download+mp4PDF 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://scripts.sil.org/OFLIn 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_off0000dbeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEB 5636 bytes
SHA-256: 0eb8980e0b341fd6d8b0f99715b40ee8210fa6e688c27ccb8bd6b9fc41ceae97
font_01_sfnt_off0000ef14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF14 10912 bytes
SHA-256: 4032a11258a7d27692f68faa270126821f1f6fb055c31da52d3f7fbff7a807e7
font_02_sfnt_off00011492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11492 16076 bytes
SHA-256: c75124cf82eb85a290f44dee9d31b74c8eae8229c650450d727e37a6e1035227