Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d2cc5704affabf1…

MALICIOUS

PDF

127.2 KB Created: 2021-07-19 21:26:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 67ed20ffcad623d4f99070732c35fd09 SHA-1: 86f90d47bc6bd43b6df70cbf0d819d6b6ba6b3df SHA-256: 9d2cc5704affabf1406a1dae2cb0402d1879f77ec2eccb12cd0c88a0d23e9b08
96 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised CMS upload storage. The ML classifier strongly indicated maliciousness. The document body is unreadable, but the heuristics and URLs suggest a link farm designed to lead users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 5

  • 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://asupuro.com/upload/save_image/files/pomexumusamevewugogej.pdf
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160702cb974bd2---tebibekonujageretakape.pdf
    • http://praxis-greve-polley.de/web/editor/files/nolagekavafutesovile.pdf
    • http://garderoba.sk/images/_file/10872612150.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c98371aa6d---97992044291.pdf
    • http://angelescare.com/userfiles/file/lasivir.pdf
    • https://vipbeachhouse.com/uploads/editor/file/5182162431.pdf
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/545cf47c37d7e79f66ac0c6e2290bcdb/kobojopo.pdf
    • http://whatdwellswithin.com/file/bujemojebeduga.pdf
    • http://bioident.pl/photos_fck/file/kopogepabenewasa.pdf
    • https://plasy.com/uploads/file/dofevirefijebokokuvibeji.pdf
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/fd7a0c8382c507d4fc22ad9b9a3dbdf3/lutesubobonizagifik.pdf
    • http://funperm.ru/content/file/getabobuxo.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078406aeb5c1---rojafinefozifipusu.pdf
    • http://akinmedical.com/uploads/file/jubuzosegenibitanebulum.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3aec14f2ca---nudonijufijob.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/55379ccfd6d2734fba1454fbb56cd526/50325230349.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087abddbf732---36838877712.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3092d386d---malodebugosuzeralin.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16075b801d5a87---48127290997.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=the+4+marx+brothers
    • 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_off00018f40.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18F40 16792 bytes
font_01_sfnt_off0001a757.bin
b0805a4d73fe0e50e1cef7ec15044b8016afec8ec60b735ff87d11fb695f4866		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A757 10416 bytes
font_02_sfnt_off0001bf02.bin
d55fd3f2b800b7fccecdf1bc9da693b27bd3c019be9bd23d6e7a248c1def5524		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1BF02 18516 bytes

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