Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c9eb6839eec609f…

MALICIOUS

PDF

87.9 KB Created: 2021-07-19 13:51:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 32259dfdb8b2a7b3476f054367931523 SHA-1: e3c8337fed718d16e0109757f4d4447fdea07f9b SHA-256: 8c9eb6839eec609f020c31b5730224876b28420e19a1fd7d77afa3e33bb83177
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, aiming to trick users into downloading a secondary malicious PDF. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://robalton.es/Albums/images/file///48042093478.pdf In PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/0juruullt62c9nsuuvnh95p1r5/warag.pdfIn PDF document text
    • http://ankaraeksioglu.com/resimler/files/vikuboweki.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/40359b6c5b7631b7e1d6678d830bd9c1/67779737511.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/bizapenixafefirobu.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/52bc6bc860caf8a80d8c1499e3556157/88851855908.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/bvttl6mma0o1jnrooc30v82fhn/40456084259.pdfIn PDF document text
    • https://saam.vn/images/content/file/duketizusit.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/sojitujitexatodaro.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/matat.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/08f6e85c8db919c3049b8bbec0dde98a/nesenanigemaxoro.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/osl8rcfvjsshvpt9mss9vjngus/51456135686.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/0b10e6e69c5a407c2090be08bd16b9b4/finatomenudilukafari.pdfIn PDF document text
    • https://biovuspharma.net/userfiles/files/kotapazamod.pdfIn PDF document text
    • http://schokobrunnen.com/idata/kobinowurijorupadi.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd0bb1acb4---63663890173.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/gigekusonitatiseg.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/5eb7433c59a7b1946f87d5295d24c137/45297631457.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/185edf485468983445316b7483653980/wawemejagoseni.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/20485885254.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/wamesufu.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/t0oibe9nsk00bkiru4el08h5dt/70413612424.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/98835145510.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/8f11b0f976fd3bfc42120449ea60f742/vibipujadepukefelog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=the+meaning+of+missionPDF 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_off0000f5e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E9 17236 bytes
SHA-256: 6050102856475f90e9a965be397ad5eb86288e2dd7b7889d618ce1ca0cb8e97f
font_01_sfnt_off00012327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12327 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B3E 10380 bytes
SHA-256: f9e1722b24d9b26e9309b174f2d4b7aa20d987534cb248a90a638923c0b16590