Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae00257f1b8ae434…

MALICIOUS

PDF

87.5 KB Created: 2021-06-26 05:41:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 20d19e7986d3dcc4a223801467ea6299 SHA-1: adda7a705eb2291f965e1d150576702252cd4a98 SHA-256: ae00257f1b8ae4340194eb1a449fc791b4f08dbf39566c65e146e8868f8d56af
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to files hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary function appears to be acting as a link farm, potentially for SEO poisoning or to distribute further malware, as suggested by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic.

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://alrukn.co/userfiles/files/xemakobisivalo.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf5c5ea8bd---11911470059.pdf
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/341a84d3c37fde715fff070d68236efa/kejekaxepemiwikotujejepi.pdf
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/9346859762892aa9c4d9c89b8586e868/zumaxorazop.pdf
    • https://www.alapan.org/fckimages/file/fazoxogitetekozurara.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a14e148d6---joxutomevaku.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160b06cd121dc7---reketawubo.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec8a23a8e9---magisidanemusitiz.pdf
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/mepekebagatetivogakowozu.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/e226b7be39e8f99fcbe32e31da9e84e6/95530248526.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d842cd1c83---30494026888.pdf
    • http://wsp.pl/userfiles/file/55665889179.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a6eef881ffb---xaxalibafiwenupitofapas.pdf
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/12866cd49913c52c2aeca1917f43b2e0/18750947675.pdf
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/2b306875628a0138fd9e2af5f76f2a70/90781343566.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/df5c1ede965cfbcefe95015daa799e0e/50134319923.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160929816d2652---75165096009.pdf
    • http://archerelectricsupply.com/userfiles/file/37570405317.pdf
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609c019aecf90---15369169973.pdf
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/8alu7cji3dn0am9vpsmdk75e2m/26183566811.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091a1813781e---76423731505.pdf
    • http://liyangah.com/Upload/file/14284919722.pdf
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/ba308321f9444c7d8c1c0f3e2472cee9/67270613055.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/1fcb2f1dbe3a1530518ac791e352f6eb/47099725574.pdf
    • http://crystalsteakandstogie.com/clients/1/1d/1dbb6d5698303b6304ae84622e226a19/File/vugukozugoso.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=total+cost+of+ownership+in+procurement+pdf
    • 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_off0000ee5b.bin
bc5e34384ed7e8bbb8fd23ff66010feae7df876e348c1e1ff42f029442c3f97d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5B 11036 bytes
font_01_sfnt_off000107e5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107E5 16792 bytes
font_02_sfnt_off00011ff7.bin
b11cbceb16bbcf8bd8c3db1a6b90dc85e6235b603362fc8702d6a599ab4d09b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF7 18320 bytes

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