Malicious PDF — malware analysis report

Static analysis result for SHA-256 872d118814663793…

MALICIOUS

PDF

85.4 KB Created: 2021-07-06 00:42:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c239844f31bb852e013fe88bc347dda5 SHA-1: f5ca1183e8926620d08e7c739623340de0da21ec SHA-256: 872d118814663793a573f86e34d0706b2e066b0215afcab3ff8aab769d831e22
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which point to compromised WordPress sites hosting further PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and link farms suggests an attempt to redirect the user to download additional malicious content, likely a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd4aaa82b4---jibiwe.pdf
    • http://change-sexy.com/files/files/mesodizujedi.pdf
    • https://vandolderskb.com/images/usr/firima.pdf
    • http://temple.mo/userfiles/file/rejalawiwefapalemilir.pdf
    • https://erdenetpost.mn/userfiles/files/xaboxumawifotude.pdf
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/1fa331f8c6bb7331187058ebfe8470b9/jukimoroteja.pdf
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a47c54c3d74---44610171846.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ccbe61fae---buvanakafiva.pdf
    • http://irths.com/upload_files/files/jefetaxogajetigidelatis.pdf
    • http://aquinasnb68.com/clients/9/9b/9b9a52ed12f3b440fa02b6ce64642487/File/bisotasojufojopolij.pdf
    • http://limoride.net/gallery/file/zulobusisoxifu.pdf
    • https://airflow-skateboards.com/upload/file/rutakigolegeroradu.pdf
    • http://mp-journal.com/media/file/baxadexeze.pdf
    • http://blevy.com/ckfinder/userfiles/files/17563724168.pdf
    • http://puzynowska-kancelaria.com/userfiles/file/342529530.pdf
    • http://gayaarchi.com/userfiles/file/20210525012507.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd2779b530---47390699563.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/30dc2486c492e2715019c2ae07fdddba/zugakemepexugavakiwaduvu.pdf
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/3f33ff5a91ecec40b91e975188920f50/fegonitobeju.pdf
    • http://softwarefactory.nl/images/file/65534854600.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160733f366342b---16172312402.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a72ab91742a---fomotobugizuje.pdf
    • http://allamericannursing.com/userfiles/file/35563932788.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=declaration+of+intent+samples
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e91b.bin
76d98c45e5870c3e0be55a0a24ce8934342fabf46fafe22cc0df0cc4b811a9e6
pdf-font-stream PDF embedded font (sfnt) at offset 0xE91B 17868 bytes
font_01_sfnt_off000117e3.bin
c8a545b7d73de2bcb0829a2e75b04196f2e5306c6e78985b5160a04a046d7899
pdf-font-stream PDF embedded font (sfnt) at offset 0x117E3 10644 bytes
font_02_sfnt_off0001303c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1303C 16792 bytes