Malicious PDF — malware analysis report

Static analysis result for SHA-256 facc00eec05bde2b…

MALICIOUS

PDF

76.9 KB Created: 2021-09-17 10:07:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c18a5d9143190b48ad1f97c6c4676895 SHA-1: 6006ae07a38c7a4da91fbf66ef0c00a28a50e415 SHA-256: facc00eec05bde2b0e0fbf82b0d4fa4d12380370abdd4e713de33f1f8c15add6
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The document's structure and embedded URLs strongly suggest an attempt to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://garglob.ru/uplcv?utm_term=android+recyclerview+search+filter+example PDF link annotation
    • http://ros-grad.ru/fck_editor_files/files/pefupemurofurawuwaxipova.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/72127622073.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/03cdaa1d2ce2ccf621f5b87bc24a0ac6/32943147018.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/gavabowubarobewukaj.pdfIn PDF document text
    • https://livres-arts.com/ckfinder/userfiles/files/45522583366.pdfIn PDF document text
    • http://expnavi.com/sites/all/sites/default/files/file/topigiburujebiratiji.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369b3fb1b5e---76435584834.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/dulagabebumom.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/karuvaneligebevelurovux.pdfIn PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/68687929262.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/mowapude.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/95488623992.pdfIn PDF document text
    • https://aviseco.ro/userfiles/file/bonidagevajositufe.pdfIn PDF document text
    • http://biosite.ru/images/news/file/69629670429.pdfIn PDF document text
    • http://interstroy96.ru/uploads/files/50673598248.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/cca2eed2e37a75ac5c77de1fff78b3d2/16177959033.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/22189691739.pdfIn PDF document text
    • http://tries.cz/media/images/upload/file/96800381837.pdfIn PDF document text
    • http://nguoigiupviec99.com/webroot/img/files/rudagejevunaliditebufuj.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee6f20f7fa---sudemelole.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c0a2ab3bd---gaketadajasumabumomod.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/fukezomo.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614311de1921d---jezisiritapu.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/38282438914.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_off0000c58c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC58C 17696 bytes
SHA-256: a2a6785f82dc5a09345396c312195cde9e287a4314a9ecff694de9dc75f27a6c
font_01_sfnt_off0000f35b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35B 11236 bytes
SHA-256: c96d24d509f86f5510d16c17a2bb8a9f49edb57f2fc6d9a2898b9dea802c283a
font_02_sfnt_off00010d96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1