Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d8832f5aa47f162…

MALICIOUS

PDF

92.7 KB Created: 2021-07-01 00:53:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 711b0a13140ff4917d0bd6d5071302d3 SHA-1: a05fcb07903655ed967cb2fcbf4f21821319d9a8 SHA-256: 2d8832f5aa47f1622c5e4933775b7effaa63ad50b64710b3e7bfc22f94054a51
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a tactic to host malicious content or redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of multiple external URIs and link farms points towards a multi-stage attack or a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/3f50f89d67637f18d39ccffca057767a/fematobuneta.pdf
    • https://asesoriagade.com/app/webroot/files/files/8418995687.pdf
    • https://a2designbg.com/userfiles/file/74374201036.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160976eb30da2f---dafivofutunovusobe.pdf
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/1f709df43d981842c8982bf612a0d824/rumal.pdf
    • http://lumieretvie.com/userfiles/file/65460673756.pdf
    • https://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/wusubimijuxuloso.pdf
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/1vjnqj66269k15lm068mu0qcb5/61055201681.pdf
    • https://gulf-rope.com/images/bulk_images/files/47118498038.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/s2h33n7p3hkkuacsqlg24pv27g/zosotumalajazu.pdf
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/90f6dd3a51668398332eab927fc2a573/wofipisitos.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d90275942---rerazusufomulujawap.pdf
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160909f67279fc---lusogepa.pdf
    • http://urgentcarepb.net/userfiles/file/1747505374.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5420588a9---57889863296.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2ff992b30---tofuboximuwuwiparibigesu.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d38416e84---debok.pdf
    • http://hotelclinton.it/userfiles/files/45199415992.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0125713994---ranegumogeva.pdf
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bcefe64a478---kiwek.pdf
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/fe3af9269cee6e44df127b5f34f9212d/67677864200.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3daeb8a7e3---mozokikapujebonojevupuz.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb3324eeb6---58594123236.pdf
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/ef0bc4ac79f7d6699c57339ebfe3f487/gezojesuwufemasama.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=convincing+someone+to+do+something
    • 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_off000107b0.bin
25b10ee177638bf9b409f32260beeb27611e271b012fd3c8193e5b2474560fcb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107B0 17540 bytes
font_01_sfnt_off00013557.bin
b9cb491f0a0e06dd7eb467a07dec5af34d8892b65f7cdb0e95ee382ae7e3877c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13557 10604 bytes
font_02_sfnt_off00014d3d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14D3D 16792 bytes

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