Malicious PDF — malware analysis report

Static analysis result for SHA-256 be5af05b527fde57…

MALICIOUS

PDF

85.2 KB Created: 2021-09-05 23:05:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 043a2cbc68a3040eda792fe8277a4796 SHA-1: 83836084a701084e45cabf488e3ebbdca8da9c9b SHA-256: be5af05b527fde570992d082f8a2b01d526f7cda14973b3b3c4a09508dc190dd
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS upload storage and disposable hosting. The ML classifier strongly indicates maliciousness, and the heuristics suggest the document is a link farm designed to redirect users to potentially malicious sites. No specific family could be identified, but the techniques used are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://agmatbaa.com/upload/files/raximofupunozulofogur.pdf In PDF document text
    • https://okinawa4d.com/contents//files/wogutigar.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/88043295378.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/2732fce7c42a7ddd9444bafbc8a080f8/15547798837.pdfIn PDF document text
    • http://lucchetta.net/userfiles/files/13391856190.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/zolovazikusaxaraf.pdfIn PDF document text
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/senopupodaki.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/jijuvoragiraz.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/6da085c24f34fbb6366509191ce649d4/kexozulebizunale.pdfIn PDF document text
    • http://dkstores.gr/userfiles/file/21768263579.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae6c9c0d719---kesurozixa.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16073e11d5f64b---17024662179.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1db74b31f---26763213196.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/64717fba66ad070e1ce43d69861e4e2b/ripufozaxuzakirasuxomojaj.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/68824113009.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/jge732bvep69jb9gp8d53ksfs0/54071303870.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/161219b581c016---81408951875.pdfIn PDF document text
    • http://flexinform.com/hirlevel/file/nizakol.pdfIn PDF document text
    • http://ezibra.pl/upload//file/41481815805.pdfIn PDF document text
    • http://thepnguyentran.vn/media/ftp/file/75806721889.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607399a22b850---vamipujonepogi.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021071304515918.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=breatheology+stig+severinsen+pdfPDF 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_off0000e3ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BA 11008 bytes
SHA-256: fd6d8bdfed5c6565623dce9b142cb42f63c7b3ad8fd00592b502c55a1f60c1d9
font_01_sfnt_off0000fd20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11532 19028 bytes
SHA-256: 26f618d5929c9ec89bee0ab8cff3971e52210f776fe802ef327b203a714b7d50

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