Malicious PDF — malware analysis report

Static analysis result for SHA-256 401dbd0e13452e02…

MALICIOUS

PDF

92.8 KB Created: 2021-06-30 09:12:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 08bf744351cc34745cdb54a12b77f60a SHA-1: 33cf38db86820ecc4d8dcc8dfe1249e4bda8835c SHA-256: 401dbd0e13452e029e771e50ce12fbd448af5f2bb99c33c86a1c3d9108aab75c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated and unreadable, providing no further context on the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://catamma.ru/uplcv?utm_term=prince+charming+quotes+from+cinderella
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e0b378687---5267476877.pdf
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/44284984487fea5f37c417e8c14e614b/zasapijupipupasotov.pdf
    • http://3colorjazz.com/fckeditor/userfiles/image/96249302248.pdf
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/72131f09b3f9d34be501feea7d40ed23/60790462633.pdf
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16082715e5066b---80681424815.pdf
    • http://aklond.com/UploadFilesfile///2021051012532973.pdf
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56171180219.pdf
    • https://mangonebike.com/uploads/file/sitifeje.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/0285ac4f335dedd74f26c34902769d7d/ripabosaniruga.pdf
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/642376a715883ae9d88971d91c12bbb8/webowenemaxivulofefipot.pdf
    • http://quatanggiabao.com/images/uploads/files/forojakokeluluzoramis.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9a2f51315---86565740651.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609736704ff8d---desegeboxaku.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160753a4aab8b4---85448106962.pdf
    • http://aimic.com/userfiles/file/jowebapadiba.pdf
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/37544348954.pdf
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/1b5ac4e4b838b637bc04f4dcfa560daa/dejupejen.pdf
    • https://aquafilling.com/userfiles/file/pewibitefoxozupevu.pdf
    • http://mygotour.com/FileData/ckfinder/files/20210619_C9D5281510B9BD87.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2ac74c0da---nasevegarime.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf1e122093---xujegojonolazudutodipal.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_off00010781.bin
2005564ec8685bdd1813eb85b7bba0606702eb8a4be1c308340fa165de48efcc
pdf-font-stream PDF embedded font (sfnt) at offset 0x10781 17444 bytes
font_01_sfnt_off0001346b.bin
5f1816b8d260697ab04c06ac1f491c00d0c97006d12dbb766a71bb5e1dcf4a8b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1346B 11172 bytes
font_02_sfnt_off00014dd4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14DD4 16792 bytes