Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f74b2861afc6f0a…

MALICIOUS

PDF

85.3 KB Created: 2021-07-03 19:05:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 96ae1e20aa0585bb501b2f55e1495da0 SHA-1: 8b2416d43a5638824ffbb2ba361380709a430022 SHA-256: 4f74b2861afc6f0aca53f1407ea59ef73854a68d14f546ebeff3c0099147aa2d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to potentially compromised WordPress upload directories. The presence of these links suggests an attempt to redirect users to malicious content or further stages of an attack, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adcdc1dd9bb---46320030309.pdf In PDF document text
    • http://zdrowejaja.com/Upload/file/93376075284.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210605230844192.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/aeb0b2913945a268338cd2cb63510da0/70206180039.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/268d88a41926c6be097471540419e538/26838431341.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/878kr2brik5dgl30u1qojsv3bv/sowevu.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/b73d468ef3ff0c32c0c551de495e6dfa/sabafipagibome.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/95092146718.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc210a10924---81849525018.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/77b6a80a2340439c5f8f0ad45032de9f/93014104863.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/ba69e3b8d7c488d1790eccd61bf59a47/bamawixavejusa.pdfIn PDF document text
    • https://brod-plovdiv.com/images/linoteviluxata.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa1c7bd9db---rudisisesiforujilezexali.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/supijike.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/g6bftu5k4ugdoorfi798h9fbad/fawapotakitirolelajejebum.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/noduvaxobisakewepuv.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/xinimatijoj.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/18191208164.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca7ad84158---77001457497.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/65af88e32c1971eddc3b3c9ae6791a82/gutirakunamebujoxebidifim.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb41ccd184---17842607184.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/menebi.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/gowebibawinodimudevu.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16090d1dd741d6---petekanonutokesulisex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+to+change+into+vampire+lord+skyrimPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C5 17464 bytes
SHA-256: 1beb960026378adf0ab22d78da7ae862804a8b4359da176946e06d2fa1cf6ee1
font_01_sfnt_off00011644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11644 11312 bytes
SHA-256: 1553d9967fa37fd3fcfec5fd8606ec7224ec0b6fa7ba9f0557c798a305d66ccd
font_02_sfnt_off00013081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13081 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1