Malicious PDF — malware analysis report

Static analysis result for SHA-256 f62a6463b0d44e45…

MALICIOUS

PDF

139.1 KB Created: 2021-06-27 02:44:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e62a675409af4c7ecf67d48e3a360029 SHA-1: 94ca8bcce9ecea29e549799c7df01a894fb90399 SHA-256: f62a6463b0d44e45ffa071db86f272ffe4bf850fdd3e20457bfb46f69efec483
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

The PDF contains numerous links pointing to compromised WordPress sites, specifically within the FormCraft plugin's file upload directory. This suggests the PDF is part of a phishing campaign or a distribution mechanism for further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9807

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://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d1c12d86a2d---xemomegomavimi.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160ade20196d9a---zuwijogota.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607cabd234005---nefanagufox.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160758d394d307---kerulujev.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/7509a65d9786f0f2ea3a3110cdba274b/jogaw.pdf
    • https://cordovajewelry.com/images/file/kimorowazawerofut.pdf
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/676cf59716c6079ac5e0ad44055b0a1e/53468380534.pdf
    • http://ajk-opakowania.eu/upload/fck/file/83795575129.pdf
    • http://acecaalcoy.com/userfiles/file/43016572843.pdf
    • https://masterjobintl.com/ckfinder/userfiles/files/todosomog.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160836d4a80f2f---84561013675.pdf
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/31229905792.pdf
    • https://totounited.com/contents//files/76373172439.pdf
    • https://aquafilling.com/userfiles/file/fizadelezukakojavepi.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b68c4122ef---xakebibemowuroxo.pdf
    • http://techscreening.com/userfiles/files/85257643104.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd1c269e88---28251975979.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e06dadfe55---lotawati.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160bc8b2765a07---30405373353.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160705a574bd1d---xumoladitavuposu.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/6d7a3003e27561139428e36522f40c37/moxoraduvakov.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/7424a6ccd3e456175a38a492c09a05f8/lasosotabobijomikeko.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=lucifer+and+satan+is+same
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019c03.bin
fab23dd40c134d6ab2e0fc0d2634c80a01c800efe6f644dd385e17b1430079e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19C03 16732 bytes
font_01_sfnt_off0001b3e5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B3E5 16792 bytes
font_02_sfnt_off0001cbfc.bin
705cd3a9d00202882667d6978b98b4fc289603a2b67e93dff4c801cb775455cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1CBFC 10528 bytes
font_03_sfnt_off0001e3ee.bin
a122bc1e8ed7d062b8a4e289cf3cdf0eacb024d3e18f5229f9d2319a230faf3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1E3EE 24952 bytes

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