Malicious PDF — malware analysis report

Static analysis result for SHA-256 c81ecafa46d79e7c…

MALICIOUS

PDF

90.4 KB Created: 2021-08-10 13:27:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0cf9a04abf3ddf315cd0dffe92b395d7 SHA-1: 13c2c2e17b260f0e1c6618de80a088e742f194f3 SHA-256: c81ecafa46d79e7c701c2cb3824304cd277084b70c7f1b2077f16024ddf0feb8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The presence of a 'download button' lure and the ML classifier's high confidence score further support a malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://philabc.ru/uplcv?utm_term=hungry+shark+evolution+mod+apk+ios PDF link annotation
    • https://skillmapmagazine.com/ckfinder/userfiles/files/44752163357.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ac79fd33abf---febogigigojonadi.pdfIn PDF document text
    • https://defaico.com/d/files/99159294372.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/purake.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/7663696714.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8e994e09c---nuwofolop.pdfIn PDF document text
    • http://groupkaishan.com/d/files/83869720994.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/xozurame.pdfIn PDF document text
    • https://e-ceramika.pl/userfiles/file/42745653510.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/34414223231.pdfIn PDF document text
    • http://phutungototuanphat.com/img-tvdl/files/lifagulo.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/kotevo.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9660173463---wofesilawoxo.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca7efe5936---97299171048.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0fe1e6f28---77656754407.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/25788412870.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b5dc0720ca9---xawijelezekoretagenu.pdfIn PDF document text
    • http://toonesk.com/upload/lojelasijekugozolu.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/fa4832fb5b1e8d533efa167596720817/visegawuwimejimarojo.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6744496c2---58603563023.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/pv2hqlqiid0ibj3iob11qgqvu5/99122062656.pdfIn PDF document text
    • http://tulsamemorialclassof71.com/clients/84987/File/kapitukunatoluzubipowijoj.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/4888546647.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/nisesapure.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160756670e16b3---17945007621.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1606c76459e3f9---fetematazorowuxa.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_off0000fc3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001144e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1144E 17404 bytes
SHA-256: 701434072b98807d81482fe40ef0fd31b3875f42c5bebd48c55de3ba10801caf
font_02_sfnt_off00014237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14237 11200 bytes
SHA-256: 672fcc8acf0793b9926ac8fa72bab3cc3205bb6e6a750d448377a1b7880adac2

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