Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd912ef02604b31a…

MALICIOUS

PDF

87.5 KB Created: 2021-09-17 01:57:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0a1ec83b04a2e462ac9522d0fc995dce SHA-1: 9c5504fc2041537aa9a9199ba6f9402407ae9c5b SHA-256: dd912ef02604b31ae6ca84746452f1cc54cc9f535cf0de4a329fade2ed7a580f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and external URI links. The PDF contains a link farm pointing to various domains, some of which appear to be compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The embedded JavaScript likely facilitates this redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cructi.ru/uplcv?utm_term=test+android+antivirus PDF link annotation
    • http://elai.kz/upload/2021/09files/210904044529266122sj9hy.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/32487375603.pdfIn PDF document text
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/83922572983.pdfIn PDF document text
    • https://doitoutdoorz.com/file/7iUIRSWpe8z63axe.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea59f1c214---vuzoxazadareserabonipu.pdfIn PDF document text
    • http://knauto.com/upload/file///64845397158.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/pujabawepafizepek.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/zewinewelusozikidevovotuw.pdfIn PDF document text
    • http://scsychem.com/upload/files/bagesagofuwuvika.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6bf7d45f3---kejewatotipobeperabulev.pdfIn PDF document text
    • https://longhoang.vn/upload/files/82760022915.pdfIn PDF document text
    • http://boonfagrandhome.com/user_img/files/soxazegaratebiliviwuju.pdfIn PDF document text
    • https://orderpoet.com/ckfinder/userfiles/files/70586999726.pdfIn PDF document text
    • https://nepalihemp.com/ckfinder/userfiles/files/botimelilugerebened.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0d29ce3a9---jisipem.pdfIn PDF document text
    • https://esvigo.com/upload/files/24740618246.pdfIn PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/90972553823.pdfIn PDF document text
    • https://nieruchomoscikomercyjne.co/files/file/wojovonav.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/37668069578.pdfIn PDF document text
    • http://safiorida.dk/operatori/userfiles/file/93404519020.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/fipevasoja.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b616e2a235---68104867196.pdfIn PDF document text
    • https://hkki.org/userfiles/files/mepivuma.pdfIn PDF document text
    • http://latiendasegura.com/contable_prueba/userfiles/file/xabakaxerigija.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/bitoxomovufidoxojus.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_off0000f1f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F3 18076 bytes
SHA-256: bc97476b67123f67b3f1245eecc945be3a3f7da1eeca0457533241d67ffa9d40
font_01_sfnt_off00012155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12155 10324 bytes
SHA-256: 2f4df4f37853e307c46a667c3fe4073ceab518447ab0d10e262bda831a725f4b
font_02_sfnt_off000138d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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