Malicious PDF — malware analysis report

Static analysis result for SHA-256 de99961d425d9ea5…

MALICIOUS

PDF

82.2 KB Created: 2021-07-07 20:44:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f5a2828e0d71ad999b9f70b44d97734b SHA-1: 0930d3bb74db34cc903cda7f8bece6974d6ef7a7 SHA-256: de99961d425d9ea54c4fb5324a6084346cc14628be81e408e8b9967b6d2bd0b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous compromised websites and potentially disposable hosting. The embedded URLs suggest an attempt to redirect users to malicious content or phishing sites, likely as part of a broader campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=5mls+in+tablespoons PDF link annotation
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160871ae921a0f---9043464953.pdfIn PDF document text
    • http://novafish.it/userfiles/files/56949153019.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/e6s1p37p1k763aqh56jtle7mod/86532805534.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607dcd2c94334---lilurub.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/2fe7dlc99t013ptsugphpeaokv/vojanokavelofixajaj.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/8rg5f7pauf6ov2dfej7d49uoi6/fezetozufoxesosetopunexug.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/0989f8c9c87eaf075489b75ac485872d/50818908997.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/77673112388.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/e57310b127851ef15fb86491890a28c6/20837766971.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/jimoforesa.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609833d40fe05.pdfIn PDF document text
    • http://teaneckhs1977.com/clients/67867/File/luneregela.pdfIn PDF document text
    • http://ozona.pt/wysiwygfiles/file/fusibonezunuvukiwir.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/8d0a56db177c8a627b0d4af59144e790/nezanovozesudubokexewet.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/fimevinixu.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/e69c1c1be4626df2dddb2322900027a1/reropekoriwaxirozimix.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160873d8e0092d---fipovogokadojatopupe.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/5c1dfbd12ba0e6f52aeea5e1b5ba20d3/mevajivonexurirorixibupi.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/ij8bsum211bk4efcs8g2iaq2ud/xujawimopopusax.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/875374e3809e0fdb9bba4449f6f649f4/rirolovoxo.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/62359595712.pdfIn PDF document text
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/hv9qkeg65db35n36qvia01k68v/67190369078.pdfIn PDF document text
    • 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_off0000c8ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8EC 16980 bytes
SHA-256: 01ac2f14812569049dfef446ec0abf1a3b39f95ee024f32b8f253beccd8b858b
font_01_sfnt_off0000f536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF536 10492 bytes
SHA-256: 8ffeed8c020a9ffafb3f9ae325a48b69059e59d6530447daccb474e5e21719f3
font_02_sfnt_off00010cca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCA 16388 bytes
SHA-256: 461b8251703f8d3018d78aa1b634443127b072188c590a14cbaa5258ce305eea
font_03_sfnt_off00012357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12357 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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