Malicious PDF — malware analysis report

Static analysis result for SHA-256 287a45b3e6655c16…

MALICIOUS

PDF

91.7 KB Created: 2021-06-28 11:49:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4496675d2b005e0022e76f7f4860b1e0 SHA-1: 3f1daf6c6b858e96bcd28ecefe9dc4e4b1543745 SHA-256: 287a45b3e6655c167a24573b60054e931bf458abdfc4046a20ac8f5eb2f61988
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and potentially disposable hosting domains. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/rr0uraa0771c4atlufork5q3j5/15027666221.pdf
    • http://thietbiotoviet.com/Images_upload/files/tikarulaben.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c9898792fd6---45299676687.pdf
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d27769b5da2---janefep.pdf
    • https://amrapalispot.com/userfiles/file/venomozezanerakudopinuze.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/u3tkdpdkojmo7e0gkcnt3sdmv0/51617231972.pdf
    • http://highlandlynxotic.com/clients/7/73/73cf6ae24f8ea70eb1cbac1dff6b0f9e/File/68872460177.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160acea30946b6---wezumekevojosiforikiza.pdf
    • http://epoxidice.ro/mm/file/gofexusizodelul.pdf
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/3de3c5d08da1ef16ab69142d882d108e/37041051322.pdf
    • https://annjulieskarpmo.com/userfiles/file/22737923550.pdf
    • http://alpha-th.com/userfiles/file/miduviso.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd46420d842---kazedijuvod.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f3c7ebdea---38274667670.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609272586400a---fupinokune.pdf
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/8aa0c81baba61185ad1c78416af78bd6/51233562331.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609201be34e64---delukibokuxupoxavaporesex.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072ed2bafb83---78132036200.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083dc1778cd7---temuvugisiwixoraxazobarix.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16082a740e3306---89571257752.pdf
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/jogokukunezazuvixog.pdf
    • http://dalnoboy.net/data/filestorage/upload/files/romuvekatid.pdf
    • http://wf515345.tw/CKEdit/upload/files/37509762376.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c2486b6ee73---vurudivax.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=hands+with+calluses
    • 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_off000105b8.bin
6329ff6f4a679cc3d60723f9c8bdfcbd22920a40081492de9762f49be1a9a2fd
pdf-font-stream PDF embedded font (sfnt) at offset 0x105B8 17180 bytes
font_01_sfnt_off00013253.bin
6bba7801ca536defd9a925e7a70c50a08e5d7c6bbb198c91c0db5c83eb412304
pdf-font-stream PDF embedded font (sfnt) at offset 0x13253 10424 bytes
font_02_sfnt_off000149e0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x149E0 16792 bytes