Malicious PDF — malware analysis report

Static analysis result for SHA-256 b758cfb01af6a650…

MALICIOUS

PDF

68.2 KB Created: 2021-09-12 01:29:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: d4c124ce4be1b7b4a96a6c43024df77e SHA-1: 11c58ed1fe65dbbd5661639523b938bce655b24b SHA-256: b758cfb01af6a65009e705467918a0f18c2fd1bc6a6d71a5187a285c9370f6f7
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 uses an image-based lure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://simondaulte.com/ckfinder/userfiles/files/nejeti.pdf In PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/3747698215.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/52721396192.pdfIn PDF document text
    • http://btsoft.vn/uploads/files/60663537224.pdfIn PDF document text
    • http://hzyixiangchem.com/upload/files/galedaxufojewer.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8f077e87b---2986584160.pdfIn PDF document text
    • http://helloslow.com/data/userfiles/files/vofolipekunifotijozedoki.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/43552757911.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613d20321eb09---94321398037.pdfIn PDF document text
    • http://fivelscope.net/fckimages/37430305041.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/57871691916.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/nogevofexataze.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8ueurn0qj74df15pkm91pdu2s3/47157123050.pdfIn PDF document text
    • http://e-motyle.natura2000.pl/imgturysta/files/zotitefomizuxa.pdfIn PDF document text
    • https://abhrian.com/userfiles/files/19678858678.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131aee62535f---wawojaritiwasafekojumiv.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/17640335051.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/45146404224.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/46257243949.pdfIn PDF document text
    • http://thehedgerowchronicles.com/ckfinder/userfiles/files/55853563044.pdfIn PDF document text
    • http://crm333.com/documentos/file/ropipadedezozar.pdfIn PDF document text
    • http://sanga.asia/userData/board/file/wabukuvafonawitawipikedip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=recover+deleted+photos+in+android+galleryPDF 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_off0000ae3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE3B 14472 bytes
SHA-256: 6cc9c3184aef14b7af44e58c748073a2a4b3afbdf7ec414703d543eb7afa800f
font_01_sfnt_off0000d1b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B3 11016 bytes
SHA-256: 457ee7e84ff4d8c48f837df066d681ebf4fff1efa5b65de1b3dddf7516e6882a
font_02_sfnt_off0000eb1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1