Malicious PDF — malware analysis report

Static analysis result for SHA-256 5248b0baf3afc0c2…

MALICIOUS

PDF

74.2 KB Created: 2021-09-01 04:12:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 8193f945a6cb2b65a040dc293f6f0ef7 SHA-1: cb42bcc127e6c23e08f547ef0e8497f3e7b46af5 SHA-256: 5248b0baf3afc0c2162eba05ce9c308c519302c4113734f20787ebf3612d8d85
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. It contains a link farm that points to multiple compromised CMS upload locations and disposable hosting sites, likely serving as a lure to a malicious site. No scripts were extracted, but the structure suggests it's designed to redirect users through a series of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://wwsm-us.com/files/file/11099596712.pdf In PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/5c4gtpe5qbcq7hgnnurkiof4et/96282013247.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/46570638197.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/pikexon.pdfIn PDF document text
    • http://gdwtechnology.com/fckeditor/file/68277122707.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/07ee31969071abf26477619d712a3a56/25346528061.pdfIn PDF document text
    • http://grupposcorcia.it/userfiles/files/jodelixabutujerojiruk.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/98jlf810jora3064jm301m6pj9/838536223.pdfIn PDF document text
    • https://svltv.in/userfiles/files/zuzaguvupu.pdfIn PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/kutobizuseju.pdfIn PDF document text
    • https://premium-house.uz/images/file/1443000167.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/22ad9e08cc1ccfef746dfdfa88313f2b/62036387486.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16086ba3d3b530---48481875668.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/7879a4f2b76bfcef237e704720ccad95/lutimemilegaxakixipav.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/64194559809.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/9fb496c62ba91977d1eb95941e2de8d1/81005425514.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/dugudirilokadibaj.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076abf61d779---topalojokujam.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/21319034845.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/34223964192.pdfIn PDF document text
    • https://badoza.net/userfiles/file/44344300255.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/27825151778.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/fa39c139b2a974bb1d2890be0ea0d786/rataluvujusuvudeles.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=do+snakes+need+to+drink+waterPDF 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_off0000bfea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFEA 16940 bytes
SHA-256: 7582528bbd5794ca825e7f5162995af609beb34ba673516c1d31d3117c3b6397
font_01_sfnt_off0000ebae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C5 10376 bytes
SHA-256: 6bdfb8bf38e3128433f94e66642644ab63e9a49c2b768b67f005fd2166027315

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