Malicious PDF — malware analysis report

Static analysis result for SHA-256 98dff5d23e550996…

MALICIOUS

PDF

83.1 KB Created: 2021-09-01 17:27:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 13e6a3e870f72d8ce1c212ec59d69325 SHA-1: c734954cf92e351d17920234fd85b0fcfe5d4413 SHA-256: 98dff5d23e550996856ef1d05ed058cf16b1ac88f09839caf7d5522bfd917ea7
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload directories and other potentially malicious sites, suggesting it functions as a link farm to distribute further payloads or conduct phishing. The PDF structure and numerous external links are characteristic of a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/d8b4ccc5386a051ab8e6782af73d4e65/zefojopisobosoponosa.pdf In PDF document text
    • http://aiskreunion.com/clients/b/b4/b417c2091670ce0b0d78f4b231aea02c/File/vifipobul.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/kobeduwubogedepi.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dba53f0a0f4---wezeviji.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/79309517153.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/sebivafomozudezapewofali.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/4ee5ce2a6b2ce460c207100b4c0ae2fc/poniwokutituku.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d230ed6974---95105136330.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/76130083866.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/c5ac3c4eef76eb9383ad0c433c576531/67366260036.pdfIn PDF document text
    • http://roanfamily.net/clients/0/01/01b24a6c100194bbc8678883f3cd4a53/File/kimowi.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/302ceed70524544d91e12724217c3eb4/70042197428.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/5624f7ca16d7001f8d1484982eef8988/14599784197.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088291be04d8---maradidanezoru.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/tibekukovipuzan.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/65375408537.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16084d19a4b668---xedanozirulafusozezija.pdfIn PDF document text
    • https://ls-machinery.com/uploadpic/files/202108221243388786.pdfIn PDF document text
    • http://lalinpress.com/ckfinder/userfiles/files/vexebukavitadelerevomoxob.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f68532bfe15---43989490773.pdfIn PDF document text
    • https://mmszke.hu/files/file/tolerukimolexoxagesifaze.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5aa441fdf---60247679684.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/8622b89259c0dcc8abc228a24a147fe9/kotetusire.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c056678f6---sonaj.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/37934809222.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=definition+of+a+stanza+in+poetryPDF 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_off0000df4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4A 10480 bytes
SHA-256: 05c85b7c43475410451d364b379019e0b7b7f3c80fc83b8fe1c5b3973f8ffcf7
font_01_sfnt_off0000f756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF756 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F68 18156 bytes
SHA-256: 8cdc220db53cfa40e2e95d17edb9110e98b89cddbe86ab21595f864265579421

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