Malicious PDF — malware analysis report

Static analysis result for SHA-256 87c0af9076ae200b…

MALICIOUS

PDF

77.1 KB Created: 2021-07-05 12:35:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d2ad5c75e7078d0615af5bab70173d49 SHA-1: 9ff16f7b29d88ef41eebce89c00c341f3206eeec SHA-256: 87c0af9076ae200ba8c84fa3b3ef4ffc99aede07146f5fbb907cef83fcaafd5f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous compromised WordPress sites, which in turn host more PDFs. This suggests a campaign to distribute malware or conduct phishing by chaining multiple compromised resources. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/5a146d32b2941b8a0735948b61798884/84360905839.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080eacdee4d3---42030963451.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa25ed8aa10---lavexasanotevunol.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f18987258235df587c2fed2de1e43cac/57362892160.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/ecfc1b48428b42f1ecdabf0cbccb1f2c/86135997808.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609893730fc2a---98574618736.pdf
    • http://richardarnoldalumni.com/clients/a/ad/ad1dcfa6f69ac51e3fe6bec18f6cf6d6/File/muredekivadiramel.pdf
    • http://asokmontridental.com/userfiles/file/82623642233.pdf
    • http://ibtaker.ps/userfiles/file/84979570314.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16093b42720c4c---puvigosurutusom.pdf
    • http://www.retorika-zidar.si/ckfinder/ckeditor_uploaded_files/files/bopevifataruvobimuga.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098aa56b854b---47012398374.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb17cef26f---87477149011.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071514428023---fefazumadawakuzom.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb05f04e1c---batilufawasisapusajirutu.pdf
    • https://unosms.us/userfiles/file/tunabajejine.pdf
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e114aabc19c---baridi.pdf
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcf027b49d---litovosejarapibadovo.pdf
    • http://www.saito-ken.jp/userdata/file/sozaxoruz.pdf
    • http://turagent007.ru/userfiles/file/refumapij.pdf
    • http://bjhtdszdh.com/v15/Upload/file/20215251545162411.pdf
    • http://shsalumniauditorium.org/clients/f/fa/fa32e32112b7cad64a7d7e78b95ed61b/File/11140600232.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ceba79261---25003096780.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087bac954962---kasasajuxudukapure.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160b3642c35653---57998120275.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/50092768c5efb0df3b3848e86781d2d8/dezibidenajafivanirokaru.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=p+value+less+than+0.05
    • 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_off0000cba7.bin
bbd31e6481771af44899abc1ff230c0ccde11ae2ebbeaec8d69889dbd3c9f854		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA7 10380 bytes
font_01_sfnt_off0000e339.bin
79623742a251b14a6aac9443665b9cd89e3857a9dd28b83e38b89947d424b866		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE339 16380 bytes
font_02_sfnt_off00010dc1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC1 16792 bytes

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