Malicious PDF — malware analysis report

Static analysis result for SHA-256 65e6be2e5f4f1c50…

MALICIOUS

PDF

120.6 KB Created: 2021-07-02 20:50:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5bf651461eca35a50b5924d954c5e4ef SHA-1: 45c19f8f1cf1da8dba88aeb57edbc48a91ba73bb SHA-256: 65e6be2e5f4f1c50e83f38eed485c45afe33eac3fde7824cbc15a7c7a5212014
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised CMS upload directories. These links likely serve as a distribution mechanism for further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 http://eros-arena-reutlingen.de/eros/userfiles/file/85890180628.pdf In PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1082e3bebf---buzijomisavalojebitabutox.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/daaa0cd6c1d1b70d5691e28da3a59b2d/mexagufetu.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/kvnpescgue1fgub0eu1kaf6mr2/xukisoxi.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608218d27c815---zinasevuzuvegezod.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210615_154306.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/0mk01op5h8l6ko9h1nh27il898/39552347691.pdfIn PDF document text
    • http://mousike.it/img_ins/files/sotowavakitufowade.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce21e44e01---girilatizabixo.pdfIn PDF document text
    • https://citytrafik.nu/images/file/nazuxidonubipimof.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9bfab666d---24725105342.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160dae9f77540b---29738136284.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/84335651301.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/3620m8n6d0qfnijfa8ridi33fj/bisosunowimi.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b94b835b01508e553802c98075ecd552/xepofigifozefos.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/u9ukcj4l28p1gm2c0cn563b999/72161630693.pdfIn PDF document text
    • http://xn--xhq021fvrwdth.com/d/files/kovoredinilawerirut.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a91c4f68d---10966395481.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/1901398306.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/8d12830213d5ffa3baf1d31b55ae86fe/90560780620.pdfIn PDF document text
    • https://tepihtrava.rs//files/guvufu.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/7af4469d4c01042b79d2aac898deffdb/fofivefowumibipudipe.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4b0a52dc8---29751618080.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609804c75a29a---17953831919.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=forest+resources+are+destroyed+due+toPDF 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_off00017ac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17AC4 16644 bytes
SHA-256: d81eadbe5d2ac72a96ea0ffe30d5d8d7afb5996ef94ff07987bda7ab3ee16307
font_01_sfnt_off0001a5b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A5B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001bdc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BDC9 10312 bytes
SHA-256: 53c968589f46a21c89fe79e9bf64cd963e8d8f9e2aedb0799dfe641684cdb8f1