Malicious PDF — malware analysis report

Static analysis result for SHA-256 c43406765d61d9c1…

MALICIOUS

PDF

87.6 KB Created: 2021-06-29 04:20:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 2e6ce3125bd4ab9be32dadcd271e81e3 SHA-1: ac7f8973a6930305f40a9f071e55bf94000c7384 SHA-256: c43406765d61d9c19ec78e5a9f9e3e928596116c34a5b8afe030be045db48cea
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.
  • 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://ankaratemizlikcim.com/depo/sayfaresim/file/76262455853.pdf In PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c951a3e4b9a---55575132264.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16093d50f16ac4---13433749060.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160bc06e042929---72428092513.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/vewavelawutorixogiga.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/77902550384.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/d5a17cafcc1e8a7453365deb6cfee39f/94082336310.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/jixovonenagorajo.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/5peaur0cpcof5m4be5c49khj84/25695032178.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/tumimezexot.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fac30d80cc---lulusejo.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea4258e1e8---15890042947.pdfIn PDF document text
    • http://jucal.es/images/file/43382864602.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/176d4ada00ecdc9e42b439778a420320/53105939051.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/voxoserevejejepipaduro.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160844295dcb71---zagejajafexogudaxixofuwef.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c91616d5b59---58262698380.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2dbb5faad---31008766950.pdfIn PDF document text
    • https://atl-50.com/files/file/bezatusodupabejebupovaxad.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/ribabazevorafutelepegip.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/8fppv4evjp456v7sa74nnngck9/61084639326.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/ropifixijevelaxazipirew.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/42a6b92857d1214e68b52c67cb4b94ee/xenedinupopadafebow.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/wapilejikogerigasomin.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/tazajotubezuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=x+zone+full+movie+download+filmywapPDF 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_off0000f42e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42E 16920 bytes
SHA-256: e38081e4a5a2d3524813d9ee211ee83d2bbcd021cc70b0367a7ad4e52d1efdbb
font_01_sfnt_off00012036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12036 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001384d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1384D 10728 bytes
SHA-256: b2d863d2b44a6cfeec833f289db6f27f21d65404a9bb38734038ddeb7ee1d1e4