Malicious PDF — malware analysis report

Static analysis result for SHA-256 011521f705fb00e9…

MALICIOUS

PDF

68.9 KB Created: 2021-05-07 02:08:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 76a34df39c081514b1e36d6fca008e87 SHA-1: 0503410a0ceabf6b315cf5f95f1a32d177a360ce SHA-256: 011521f705fb00e9ee9b6e7e235d385d3399b556ff961f2e5ac4cfe4f7fa68d3
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document's structure and URL patterns suggest it's designed to lure users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://archism.ru/uplcv?utm_term=template+cv+bahasa+inggris+untuk+fresh+graduate PDF link annotation
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16093b3f1b8995---pewoxexodojamis.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-2/20210502094643444520.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/sidusemonu.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16082d800d4e86---gesawudapefuvozoguneki.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/d7a570d761591391b0fcda91561f4f02/3185847032.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/mavusu.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945c2fe206f---90317546592.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/1fe76c52bb13b3357ba6152b00331049/xebepuvusaf.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f654202a26---vidagemijodevuxomotu.pdfIn PDF document text
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/9772d842713428e6eea2b4ff616afc57/roburaba.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/23797848687.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/ab9c73ad3def291f30fb84fb4bdfcd57/13277365304.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/ladureforikefibam.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16072ba2ea05fb---rapufevud.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8b5311c55---nafomofo.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/da8obmj29fge6n7a7g78ckf0ch/lujunemudopar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD57 5784 bytes
SHA-256: 78a2e93ed2794df4afea99ff26a7aa5b292041df34c51a60814e2c64180cff9e
font_01_sfnt_off0000e0d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D5 10560 bytes
SHA-256: 775870138f298aedb90d44a416cf755dc94848ce9348001e713e4a962dc7f88b