Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec409f751c065eb4…

MALICIOUS

PDF

85.2 KB Created: 2021-08-22 02:05:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 42126b519feb07587c4af06e62b739fc SHA-1: f151672a759e3432d1e1bf628cb8a00cccfcbf3c SHA-256: ec409f751c065eb459a8cca2812694028e81c4a1a82e104a58870bdc9e14f037
164 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised websites and link farms, suggesting an attempt to redirect users to malicious content. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://bloomland.com/sites/bloomland.com/files/vinaga.pdf In PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160986b368b8c2---nelasubumafavite.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/l1290i003343sfrqono6sn5ed2/tojazipe.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/bivejopagewiwerumuf.pdfIn PDF document text
    • https://bbu.vn/Images_upload/files/vojuturoz.pdfIn PDF document text
    • http://eltprof.ru/userfiles/file/vaviga.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/96676048809.pdfIn PDF document text
    • http://voxel-avocats.fr/uploads/file/zagidopupowatasin.pdfIn PDF document text
    • http://faradbox.pl/files/file/84305874565.pdfIn PDF document text
    • http://samtle.net/ckupload/files/58297334551.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/bufixolisone.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/8lr5cenmipa57fbh8nkdtd6lin/ziwagikasupibotepodijalaz.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ea63176dfb---valisukona.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a4270a75b19---ruwojufofepeviperij.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/96474372708.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/95337061387.pdfIn PDF document text
    • http://biosite.ru/images/news/file/12717318980.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/502849ce227463d298689a12afa76418/selanot.pdfIn PDF document text
    • http://fteq.ru/files/file/dimimesamakigisagodotu.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/j1hqrpsdmll63dgoeu12fn19oc/palijakezitogupox.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/tunubotizejefigulota.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddda9d1de7d---3315548.pdfIn PDF document text
    • https://alyansdugunsalonu.com/userfiles/files/70371574080.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=spartacus+blood+and+sand+full+episode+download+480pPDF 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_off0000e4a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A0 11424 bytes
SHA-256: fa760a44da33a0f665e6dd65a8401cbd0d742c02eb3f45274b5fa370f2e4bb69
font_01_sfnt_off0000ff8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8C 17868 bytes
SHA-256: 027163c29797609bc03e802affc9b8a1ef6fe921a1bde2c190a0c1df81a8132f
font_02_sfnt_off00012e68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1