Malicious PDF — malware analysis report

Static analysis result for SHA-256 fadce5f6d82f0f01…

MALICIOUS

PDF

84.5 KB Created: 2021-09-11 22:30:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e9b19d3cef3d792f3e15b4fe0bab557c SHA-1: f5fd1099acdd5f80b59defcf95b13ee4927a41fc SHA-256: fadce5f6d82f0f015228ee1935d06e932bd69403441a0e79388002f22e357fca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://aokisuper.com/ckfinder/userfiles/files/52595710889.pdf In PDF document text
    • http://envisystem.com/upload/userfile/files/9297428858.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eecd8aaf89---60217494223.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/xaferapipobazij.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161339d7509d21---gejifelowizovosabifuwu.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/malatezogujabuba.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/66604255608.pdfIn PDF document text
    • http://quatangsongvan.com/hinhanh_fckeditor/file/55305965921.pdfIn PDF document text
    • http://eva.am/files/9f9332b86c67b7c6.pdfIn PDF document text
    • http://planetamama.ru/files/file/99872918277.pdfIn PDF document text
    • http://makeyourpartnermelt.com/userfiles/file/21291297188.pdfIn PDF document text
    • http://playonathletics.com/userfiles/file/jemekopugifapekubub.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/20726cb595b7d8a8cd69e8c8e46ecfa9/40690854030.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613c10c958abb---pipuxilidibusumilimamifes.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/notuxajex.pdfIn PDF document text
    • https://krygina40.ru/UserFiles/File/xuledofijemaladirufekiga.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/53627282806.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/4717640886.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/52892012939.pdfIn PDF document text
    • https://lekkermooi.nl/userfiles/file/12086578718.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16138386d92610---wowoluxojor.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/22787595183.pdfIn PDF document text
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/37568703693.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/21034210777.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=download+snyder+cutPDF 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_off0000dd66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD66 20560 bytes
SHA-256: 7a5a5f6f42f127f36d335f104f8181035766ab1661b3cb25b6e57b7685b59552
font_01_sfnt_off000113ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113CA 10572 bytes
SHA-256: cabaf97caee9d2e7fdc945ad0ad59e53a4c010cdaf48e98c4fd0cdc89a518d23
font_02_sfnt_off00012c2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1