Malicious PDF — malware analysis report

Static analysis result for SHA-256 b58da50f8108ffcc…

MALICIOUS

PDF

88.3 KB Created: 2021-09-01 16:25:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: abfab1e934f45cf019cf0eea16927edc SHA-1: 9486e586c3d2e66453f9ccae828c91c761229fb6 SHA-256: b58da50f8108ffccb746ca175b1b579ad030332b0448c7073338efb871bfe1b7
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous links to external PDFs hosted on compromised websites and disposable domains, suggesting a phishing or malware distribution campaign. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, pointing to attempts to disguise malicious content with seemingly legitimate or SEO-optimized URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • 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 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 https://philabc.ru/uplcv?utm_term=software+project+management+by+bob+hughes+and+mike+cotterell+5th+edition+pdf+free+download PDF link annotation
    • https://x-software.cz/data/file/pudojukemivululi.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/69118408640.pdfIn PDF document text
    • http://wych123.com/upload/files/52157083010.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/wubudif.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/mijureli.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/50743045034.pdfIn PDF document text
    • http://concept-art.nl/app/webroot/files/userfiles/files/godekibutikujowoboleporu.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/80532607275.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/rngs76gck82fmpv4ht8alck4st/65693417916.pdfIn PDF document text
    • http://matraholding.hu/images/userfiles/files/lopumitisotaroviva.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/78062134156.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/90155683268.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/29047187332.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/e66275e86efd80218b10848c2c2c7c53/sigerafubipad.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/1126643515.pdfIn PDF document text
    • http://alkanboya.com/files/file///xepakusotibesezejopo.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca2b23247af---88081222196.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f84f60dbdb5---xotavorudaw.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/e452288281b9b49f01b9383fe4fe859b/nojorurobazaduxa.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/90845908110.pdfIn PDF document text
    • http://senn60reunion.com/clients/876260/File/gexokatawoxakadew.pdfIn PDF document text
    • http://bracyfamilyreunion.com/clients/c/c2/c2db1a97f769835965582c74015c7782/File/kukuxofo.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/51535772083.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED04 11940 bytes
SHA-256: 8e49e54571bdf8b3dcd7855b30a080fd0ce2f140ffa5fdd31a0e09ed3e014961
font_01_sfnt_off0001092a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092A 18804 bytes
SHA-256: d16af98268ef25d369a3fec7909cc77cc00cbd676679a6d7aac988f972c96a19
font_02_sfnt_off00013adf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ADF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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