Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c6077fedac2b1b7…

MALICIOUS

PDF

86.7 KB Created: 2021-07-19 03:33:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f0f8007c45d2b32ca0f331b6b9a387d5 SHA-1: 223d15f03ad0dba7a6caee4f3142aade0467dd96 SHA-256: 0c6077fedac2b1b7b17a886fb204f868ffba468a6014cc133e2544691318bce3
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with multiple URLs pointing to compromised WordPress sites. These links are likely designed to redirect users to malicious content or phishing pages, a common tactic for initial compromise. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075abb19c0e5---41919875621.pdf
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/53npamk4fpo515ik3040p584kq/zojojep.pdf
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/bff2c3dfe70a5196fb1a541ef350756b/dazidesarow.pdf
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/11657021060cd5da863293.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16070ca5ac42c9---40169399299.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a8af0f173a3---gudepirazaxej.pdf
    • https://zabulgaria.org/userfiles/file/nejafiladixibagopaxobizeb.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a568a598804---pipiju.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/ticagsv03d89hrq06m00shiuru/99846812672.pdf
    • http://falconartistmanagement.com/ckfinder/userfiles/files/86343857399.pdf
    • http://botosani.ro/img/uploads/file/4941538684.pdf
    • https://akproauto.com/nbloom/fckuploads/file/56337285099.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/5457fc6452b9ae06af9cdfee2c4884ba/67327439541.pdf
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/cm48hel3msg9rc1gntmefd6iun/21956401455.pdf
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/160928290bcdc3---68567788969.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a23ea272cb3---38635164816.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160e612cc8110f---butopebegerenulizilate.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078bda049546---69962093.pdf
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/7132056491.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160968bca13175---54869219527.pdf
    • https://couvreur-hautdoubs.fr/internet_new/images_et_fichiers//file/finomukatudexibur.pdf
    • http://beepost.vn/upload/userfiles/files/71852209345.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec6aff278a---83043831974.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088f09ece7a8---wovunumobolaxesiz.pdf
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/0eoae1ggsq815pfr9aevhlfdp0/witekumit.pdf
    • http://ordinate-ltd.com/file_media/file_image/file/veriseb.pdf
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/74400221663b89e735c03b02cdb9a2f3/82269995378.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=regular+verbs+in+present+past+and+past+participle
    • 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_off0000f071.bin
a932aa275195bc2856584512d84fc79f24c59322f1a3a1f1e6c9d4e87626ee3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF071 10920 bytes
font_01_sfnt_off00010973.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10973 16792 bytes
font_02_sfnt_off00012185.bin
41e6680dc1ee81bcacc6a3f67b0d4578216f0ed6a2b7d26c3e1ef4b8c3bc6458		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12185 16688 bytes

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