Malicious PDF — malware analysis report

Static analysis result for SHA-256 280527fda909e683…

MALICIOUS

PDF

77.4 KB Created: 2021-07-01 17:11:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: f42a3a0aec9d1c0ebec8c5d7504cb086 SHA-1: 3cf85a00c3675d8deacdde29cfaf1004fa112b07 SHA-256: 280527fda909e6837ca9be3485d8ccbb58b15d0d13d5ffde769067446bf701c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm directing users to multiple URLs, many of which are hosted on compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the structure suggests it's designed to lure users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/8418874ee143220d83f348dc7cee3c55/14220171348.pdf In PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/n1ac9iavoqueqnpe1c3c9euk8n/35193842055.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/36dfe7c6aae543caeb7a85923c860c14/borejivuk.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba9a52c319d---videdukopu.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/3ec7b5b672dcdd474b7d41a29ed2bfc7/posuxifutotafadow.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/bebabaw.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/penojegov.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608fefe7a9e3a---14288869094.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a784d7164---93746681112.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/dad2db409b818eeb3fa972c89d93d0f3/lozenunubevobatasezogosa.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/e663caf6b3a69b79f92ec3a445c52a7f/96115684665.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/bamixafegari.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f8abc8fd4---97253216627.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/xokobiwejusuro.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/iouodkd4c18oceadjhh3so15ro/24119931212.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a797634aa8---xaralofurojaj.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/0e5e05ce9131a8ff33d34a715f28ee70/wezoko.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/49172536476.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/3i3resdoc602eefjtq0t2vknvp/19997694701.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/0eed11b8eefda98b9510a9fa2181fdd8/rigazisusatagawip.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/zomozesa.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/sanixisefarejuxutanumu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=dr+wong+gynaecologistPDF 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_off0000cc66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC66 10608 bytes
SHA-256: 25143a782d64d3e4840dbcc7bf480d6a4843c1464da419e32ebd2166a5fc0e7b
font_01_sfnt_off0000e4d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D9 16848 bytes
SHA-256: 101b2f4e3e00f70ecb467ee95c24bca10a790b67216fae0d0fbb2431e1e4a9eb
font_02_sfnt_off000110a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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