Malicious PDF — malware analysis report

Static analysis result for SHA-256 17254989914366e9…

MALICIOUS

PDF

76.8 KB Created: 2021-09-12 17:46:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 99e63a8243e5987c664876465bbac81f SHA-1: 8f13978c44c0e6c741bdf12eb5c134bcefa345e7 SHA-256: 17254989914366e911d3f5704159eb9e030a6a51f7dea9df7714885b781f5d74
172 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. It uses an urgency-based lure. 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 0.9980

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 http://zhizhencn.com/filespath/files/20210908165839.pdf In PDF document text
    • https://damsindia.org/admin/uploads/file/zelugogefijinitegud.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/88fcc6463b5fec2c1c844954284961e4/mosepiwuvisokikibazid.pdfIn PDF document text
    • https://kar360.com/resimler/files/vogibipetadoj.pdfIn PDF document text
    • https://hsse.hssanesteban.cl/files/56224482720.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/69893665268.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/1755809680.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/qkgbcpusrijbjhmfho32o2v8h6/97690448844.pdfIn PDF document text
    • http://teknis.it/userfiles/files/13297700521.pdfIn PDF document text
    • http://loaamtran.vn/files/usersfiles/files/59310473088.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/399468229.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/52107760623.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1613216111878e---kirajibirasogavi.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0a48b3bcb---vezegiponede.pdfIn PDF document text
    • http://premiercontainerlines.com/media/ftp/file/43663181475.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/wofumerokevuzogojazirino.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbeb1108b2---68924467398.pdfIn PDF document text
    • https://mackbeks.com/files/file/jakixujuna.pdfIn PDF document text
    • http://vikingpaint.com/user_file/file/betakudunaduwuxod.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba7fa4b537---turuwinamatenidone.pdfIn PDF document text
    • http://litroshaber.net/resimler/files/xusikepulavelowagas.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/25954330117.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=iphone+live+wallpaper+makerPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c42c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC42C 10448 bytes
SHA-256: 5dc6b2fd1cb463115012c541a2767779e08a51c6b1ef3bce0784cf657bfa92c4
font_01_sfnt_off0000dba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA1 19248 bytes
SHA-256: 0410877737823d3762ab692a763c167b86daed391a4f63d1402dffeb67ac9567
font_02_sfnt_off00010d74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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