Malicious PDF — malware analysis report

Static analysis result for SHA-256 865f9d749fad1179…

MALICIOUS

PDF

89.4 KB Created: 2021-08-19 20:01:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e731fd562bb8604b9adbc6bf9458b81a SHA-1: 0880dd92e891c4441fbd7777fb0dc95450873575 SHA-256: 865f9d749fad117951632eef2a9d4232d0ff46b97c210d9aab73814d28d2b7f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many of which point to compromised CMS upload storage and disposable hosting. This behavior is indicative of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://synphabase.ch/upload/file/legovagokuzof.pdf In PDF document text
    • http://stphilomenaonline.org/userfiles/file/bijikofiwovev.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/53c4661e90edb899de39c11376485197/44214272366.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/2798397787.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160943ca235c70---45111246355.pdfIn PDF document text
    • http://tvsatkrosno.pl/userfiles/file/26071280496.pdfIn PDF document text
    • http://nessie-vinylcare.com/file/wipivuwaf.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/gimuno.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/85624835528.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160842e3d71d3a---jesuweluvazi.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3db16c770---70503999024.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/0vr13fm9274kbp5lha7g2a0hvq/gizometodi.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/83897107609.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/sodemijoxojozetofuwixufok.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1f343a36d---27443584004.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/fb3b1e6b308cab8a45ea663565c1f7bb/12483211350.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/16d150b14f065760b1205873d8eec476/49417766464.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/32754283945.pdfIn PDF document text
    • http://flightshop.jp/images/blog//file/9590695041.pdfIn PDF document text
    • http://dmkert.hu/files/file/49221202326.pdfIn PDF document text
    • https://studiorampinelli.com/file/54441430080.pdfIn PDF document text
    • https://fid-data.fr/app/webroot/uploaderfiles/37985750073.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=no+small+affair+1984+full+movie+watch+online+freePDF 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_off0000f778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF778 11336 bytes
SHA-256: deb9b752f9948f5b3543841321aa64eef948103216dff3033c26bfe39d1b859f
font_01_sfnt_off00011221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11221 17172 bytes
SHA-256: f8dd7bd4a0dd0f064d9d7b31f7a5306897d1efbfb2c07d754ef9cf39b9137c7a
font_02_sfnt_off00013e79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1