Malicious PDF — malware analysis report

Static analysis result for SHA-256 add73e0c3ac0a4ed…

MALICIOUS

PDF

156.3 KB Created: 2021-07-23 00:21:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e14621c6f87dbadad19bafb0a0178afb SHA-1: 4038de9dcfb9129e915a0d4348c7dc6a7cbc073f SHA-256: add73e0c3ac0a4ed3f2b2bf29666c1e2f4bfe8b74ec655cc6c23e2df53b693d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or SEO abuse. No scripts were extracted, but the PDF structure itself is used to host and distribute links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8639

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://www.ciesol.es/ckfinder/userfiles/files/nobewuzivatadokizav.pdf In PDF document text
    • http://afghansolar.com/userfiles/file/74013072756.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160789ff1b155f---naxejebuzexezugojode.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1233e6db955abafa7678123eb8c79027/lasewaxofakus.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf409a89037---sosevetidix.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/9fbf2cd957eb74def3087c07d174cf46/36555466335.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/51711681674.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084235ab088d---folokumajabigok.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/6umuargfqv58m0srvmvjdc19e2/bigidi.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/2262a536b3ab654b00973e806d909a20/85298127670.pdfIn PDF document text
    • http://bociany.sk/media/file/sugiletedulelada.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8c5161b9dc---sizomukaf.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160ba2e7005871---pikigalaxinenoletur.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/webawedasupa.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/93668155569.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/galogorujemopameraxalanez.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16089c5fe7ec06---vozovewego.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/lolaxor.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/bizanuwujodipodajo.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/84453431173.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/971006729fbef8cd1de21adba737511c/feragoverujufotibowarika.pdfIn PDF document text
    • http://padgettlawreunion.com/clients/79772/File/kafalajowokuwunovetibokug.pdfIn PDF document text
    • https://lacecinella.com/writable/public/userfiles/file/91949758443.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/dbe34dafe9ddacc0c7cf74b67e8b22b9/13605533229.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/8406c906520040eb5dfe9490c564b2c9/rawuwumugalaxaletusubunu.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/84960675249.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=all+mosfet+equivalent+book+datasheetPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001e754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E754 11044 bytes
SHA-256: 6f0d57242bc71ca86e7998b3f0ffc5e5a0586e15654d65f7221823d4b4ff1a20
font_01_sfnt_off000200a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x200A4 5120 bytes
SHA-256: fbe972f0be2091d012e0290fbc66c60e42eaac984e83b892d975e7f09caa62d8
font_02_sfnt_off00021352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21352 21516 bytes
SHA-256: ceebff81c8c24cd2c56c2be0e26c014162a7d2c5f372564ac02291d208c99fcd
font_03_sfnt_off00024a83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24A83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1